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	<title>1jour1actu - Les clés de l&#039;actualité junior &#187; Science</title>
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		<title>Expo : pars à la découverte du corps humain !</title>
		<link>http://1jour1actu.com/science/anatomie-du-corps-humain/</link>
		<comments>http://1jour1actu.com/science/anatomie-du-corps-humain/#comments</comments>
		<pubDate>Sun, 16 Jun 2013 06:00:50 +0000</pubDate>
		<dc:creator>Emilie Formoso</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=139321</guid>
		<description><![CDATA[16 juin 2013<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/anatomie-3D-ok2-300x164.png" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir une reconstitution anatomique virtuelle en 3D d&#039;une cage thoracique
© IRCAD – France" /></p><p><strong>Aujourd’hui, les médecins explorent le corps humain sous toutes ses coutures grâce à la technologie. Mais autrefois, comment connaissait-on son fonctionnement ?<br />
</strong></p>
 <a href="http://1jour1actu.com/science/anatomie-du-corps-humain/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	16 juin 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/anatomie-3D-ok2-300x164.png" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir une reconstitution anatomique virtuelle en 3D d&#039;une cage thoracique
© IRCAD – France" /></p><h2><strong>Pourquoi en parle-t-on ?</strong></h2>
<p><strong></strong>Jusqu’au 5 janvier 2014, l’exposition « Corps en images » balaie 25 siècles de connaissances anatomiques au Muséum-Aquarium de Nancy.</p>
<h2><strong>L&rsquo;actu du jour :</strong></h2>
<p><strong></strong>À ton avis, comment les médecins ont-ils étudié le corps humain ? En l’ouvrant pour étudier son contenu ! Cette pratique porte un nom, <strong>la dissection</strong>.</p>
<p><span style="color: #000000">Au <strong><span style="color: #800080">Moyen Âge</span></strong>, il est interdit de pratiquer la dissection du corps humain pour des raisons religieuses. </span>Pour comprendre le fonctionnement du corps, les médecins observent celui des mammifères comme le porc ! Par conséquent, la connaissance n’avance pas, car ils continuent à utiliser les vieux travaux d’Hippocrate et Galien, les deux grands médecins de l’Antiquité.</p>
<p>Heureusement, à la <strong><span style="color: #800080">Renaissance</span></strong>, le corps humain devient un objet de recherche scientifique et l’invention de l’imprimerie permet la diffusion du savoir. La dissection est permise et de grands anatomistes, comme André Vésale au 16e siècle, dessinent des planches où l’on voit le corps de plus en plus détaillé.</p>
<div id="attachment_139329" class="wp-caption alignnone" style="width: 199px"><a href="http://1jour1actu.com/wp-content/uploads/planche-anatomique-vesale.jpg"><img class="size-full wp-image-139329 " title="Planche anatomique représentant le squelette, tirée du traité d'anatomie d'André Vésale &quot;De humain corrois fabrica&quot;, 1555 © Bibliothéque-médiathéque de Nancy" alt="Planche anatomique représentant le squelette, tirée du traité d'anatomie d'André Vésale &quot;De humain corrois fabrica&quot;, 1555 © Bibliothéque-médiathéque de Nancy" src="http://1jour1actu.com/wp-content/uploads/planche-anatomique-vesale-OK1.jpg" width="189" height="340" /></a><p class="wp-caption-text">Planche anatomique représentant le squelette, tirée du traité d&rsquo;anatomie d&rsquo;André Vésale &laquo;&nbsp;De humain corrois fabrica&nbsp;&raquo;, 1555 © Bibliothéque-médiathéque de Nancy</p></div>
<p>À partir de la <span style="color: #800080"><strong>Renaissance</strong></span>, l’anatomie est enseignée à l’université. Pour faire comprendre le fonctionnement du corps humain aux étudiants, on utilise des cires anatomiques et des écorchés.</p>
<dl class="wp-caption alignnone" id="attachment_139381" style="width: 236px">
<dt class="wp-caption-dt"><a href="http://1jour1actu.com/wp-content/uploads/ecorche-ok1.jpg"><img class="size-full wp-image-139381 " alt="Sur cette photo, tu peux voir un écorché démontable en papier mâché, 1887. ( © Muséum-Aquarium de Nancy)" src="http://1jour1actu.com/wp-content/uploads/ecorche-ok1.jpg" width="226" height="340" /></a></dt>
<dd class="wp-caption-dd">Un écorché démontable en papier mâché, 1887. ( © Muséum-Aquarium de Nancy)</dd>
</dl>
<p>À la fin des <span style="color: #800080"><strong>années 1970</strong></span>, la « plastination » est inventée. En partant d’un vrai corps humain, ou d’une partie d’un corps, on « fige » peu à peu les tissus (muscles, veines, organes…) avec de la résine plastique. C’est un procédé compliqué, mais qui permet d’obtenir un résultat très détaillé et réaliste.</p>
<div id="attachment_139377" class="wp-caption alignnone" style="width: 629px"><a href="http://1jour1actu.com/wp-content/uploads/anatomie-3D-ok2.png"><img class="size-full wp-image-139377  " alt="Sur cette photo, tu peux voir une reconstitution anatomique virtuelle en 3D d'une cage thoracique © IRCAD – France " src="http://1jour1actu.com/wp-content/uploads/anatomie-3D-ok2.png" width="619" height="340" /></a><p class="wp-caption-text">Une reconstitution anatomique virtuelle en 3D d&rsquo;une cage thoracique<br />© IRCAD – France</p></div>
<p>La première radiographie est réalisée en 1895. C’est une avancée majeure : on peut voir le corps humain sans l’ouvrir et pratiquer l’anatomie sur un être vivant sans le faire souffrir !</p>
<p>Grâce à l’imagerie médicale (<strong><a href="http://1jour1actu.com/france/le-mot-du-jour-scanner/">scanner</a></strong>, échographie, imagerie par résonance magnétique…), le corps devient transparent et livre ses secrets en direct.</p>
<p>Aujourd’hui, il est même possible de restituer avec des images virtuelles certaines parties du corps en <strong><a title="3D" href="http://1jour1actu.com/planete/la-planete-mars-filmee-en-3d/" target="_blank">3D</a></strong>.</p>
<h2><strong>Le quiz du jour :</strong></h2>
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  <h2>Sur l'anatomie</h2>
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  <div id="mtq_quiz_results_bubble-1" class="mtq_quiz_results_bubble"> <div id="mtq_quiz_results-1" class="mtq_quiz_results"><strong>Comment au Moyen Age les médecins prenaient-ils connaissance du corps humain ?</strong>
Ils prenaient des mesures
Ils disséquaient des corps humains
Ils observaient des corps d'animaux

<strong>Comment les enseignants font-ils pour mieux faire comprendre le fonctionnement du corps humain ?</strong>
Ils utilisent des cires anatomiques et des écorchés
Ils utilisent du plâtre
Ils dissèquent un étudiant pour le montrer aux autres

<strong>Comment s'appelle la technique pour voir le fonctionnement du corps humain sans l'ouvrir ?</strong>
La radiographie
La mamographie
La photographie

<strong>Que signifie le terme grec "tomia" ?</strong>
Observer
Couper
Triturer

<strong>Parmi ces techniques, laquelle permet de ne plus ouvrir le corps humain pour le comprendre ?</strong>
La plastination
L'imagerie médicale
La dissection

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            <div class='mtq_question mtq_scroll_item-1' id='mtq_question-1-1'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-1' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-1' class='mtq_question_text'><strong>Comment au Moyen Age les médecins prenaient-ils connaissance du corps humain ?</strong></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-1' onclick='mtq_button_click(1,1,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-1' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-1' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-1' class='mtq_answer_text'>Ils observaient des corps d'animaux.</div></td></tr><tr id='mtq_row-1-2-1' onclick='mtq_button_click(1,2,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-1' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-1' class='mtq_answer_text'>Ils disséquaient des corps humains.
</div></td></tr><tr id='mtq_row-1-3-1' onclick='mtq_button_click(1,3,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-1' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-1' class='mtq_answer_text'>Ils prenaient des mesures.

</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-1' id='mtq_question-2-1'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-1' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-1' class='mtq_question_text'><strong>Comment les enseignants font-ils pour mieux faire comprendre le fonctionnement du corps humain ?</strong></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-1' onclick='mtq_button_click(2,1,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-1' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-1' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-1' class='mtq_answer_text'>Ils utilisent des cires anatomiques et des écorchés.</div></td></tr><tr id='mtq_row-2-2-1' onclick='mtq_button_click(2,2,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-1' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-1' class='mtq_answer_text'>Ils dissèquent un étudiant pour le montrer aux autres.</div></td></tr><tr id='mtq_row-2-3-1' onclick='mtq_button_click(2,3,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-1' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-1' class='mtq_answer_text'>Ils utilisent de la pâte à modeler.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-1' id='mtq_question-3-1'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-1' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-1' class='mtq_question_text'><strong>Comment s'appelle la technique pour observer le fonctionnement du corps humain sans l'ouvrir ?</strong></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-1' onclick='mtq_button_click(3,1,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-1-1' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 3, Choice 1'>A</div><div id='mtq_marker-3-1-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-1-1' class='mtq_answer_text'>La photographie.</div></td></tr><tr id='mtq_row-3-2-1' onclick='mtq_button_click(3,2,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-2-1' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 3, Choice 2'>B</div><div id='mtq_marker-3-2-1' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-2-1' class='mtq_answer_text'>La radiographie.</div></td></tr><tr id='mtq_row-3-3-1' onclick='mtq_button_click(3,3,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-3-1' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 3, Choice 3'>C</div><div id='mtq_marker-3-3-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-3-1' class='mtq_answer_text'>La mamographie.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-1' id='mtq_question-4-1'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 4</div><div id='mtq_stamp-4-1' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-4-1' class='mtq_question_text'><strong>Que signifie le terme grec "tomia" ?</strong></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-4-1-1' onclick='mtq_button_click(4,1,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-1-1' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 4, Choice 1'>A</div><div id='mtq_marker-4-1-1' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-1-1' class='mtq_answer_text'>Couper.
</div></td></tr><tr id='mtq_row-4-2-1' onclick='mtq_button_click(4,2,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-2-1' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 4, Choice 2'>B</div><div id='mtq_marker-4-2-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-2-1' class='mtq_answer_text'>Triturer.</div></td></tr><tr id='mtq_row-4-3-1' onclick='mtq_button_click(4,3,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-3-1' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 4, Choice 3'>C</div><div id='mtq_marker-4-3-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-3-1' class='mtq_answer_text'>Observer.
</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-1' id='mtq_question-5-1'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 5</div><div id='mtq_stamp-5-1' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-5-1' class='mtq_question_text'><strong>Parmi ces techniques, laquelle permet de ne plus ouvrir le corps humain pour le comprendre ?</strong></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-5-1-1' onclick='mtq_button_click(5,1,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-1-1' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 5, Choice 1'>A</div><div id='mtq_marker-5-1-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-1-1' class='mtq_answer_text'>La plastination.
</div></td></tr><tr id='mtq_row-5-2-1' onclick='mtq_button_click(5,2,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-2-1' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 5, Choice 2'>B</div><div id='mtq_marker-5-2-1' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-2-1' class='mtq_answer_text'>La dissection.</div></td></tr><tr id='mtq_row-5-3-1' onclick='mtq_button_click(5,3,1)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-3-1' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 5, Choice 3'>C</div><div id='mtq_marker-5-3-1' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-3-1' class='mtq_answer_text'>L'imagerie médicale.</div></td></tr></table></div>            <div id="mtq_results_request-1" class="mtq_results_request mtq_scroll_item-1">
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<p><span style="color: #800080"><strong> INFOS PRATIQUES</strong></span><br />
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]]></content:encoded>
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		<slash:comments>11</slash:comments>
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 <pubDate>Sun, 16 Jun 2013 08:00:50 +0000 UTC</pubDate>  
	</item>
		<item>
		<title>ISS : Ça te tente un voyage dans l’espace ?</title>
		<link>http://1jour1actu.com/science/iss-station-spatiale/</link>
		<comments>http://1jour1actu.com/science/iss-station-spatiale/#comments</comments>
		<pubDate>Thu, 06 Jun 2013 09:24:40 +0000</pubDate>
		<dc:creator>Clémentine Genévrier</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=138347</guid>
		<description><![CDATA[6 juin 2013<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/espace-300x164.jpg" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir deux cosmonautes qui travaillent sur la Station Spatiale Internationale. (© AFP PHOTO/HANDOUT/NASA)" /></p><p><strong>En route vers la Cité de l’espace à Toulouse où des élèves de CM1 et CM2 ont joué aux scientifiques ! Munis de leurs badges et de leurs petites mallettes, ils sont devenus de véritables « congressistes scientifiques ». Notre balade sonore.</strong></p>
 <a href="http://1jour1actu.com/science/iss-station-spatiale/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	
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6 juin 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/espace-300x164.jpg" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir deux cosmonautes qui travaillent sur la Station Spatiale Internationale. (© AFP PHOTO/HANDOUT/NASA)" /></p><h2><span><b>Pourquoi en parle-t-on ?</b></span></h2>
<p>Parce que le 4<sup>e</sup> congrès scientifique des enfants s’est déroulé à la Cité de l’espace à Toulouse vendredi 31 mai. 140 enfants âgés de 9 à 11 ans ont présenté leurs exposés sur le thème « Femmes et hommes dans l’espace ». Ils ont également assisté à des conférences et ont pu rencontrer l’astronaute française <strong><a href="http://1jour1actu.com/les-portraits/claudie-haignere/">Claudie Haigneré</a></strong> qui était la marraine de cette journée.</p>
<h2><b>Notre balade sonore</b></h2>
<p>Premièrement, munis-toi d’un casque ! Qui dit balade sonore, dit oreilles et tonalités. Clémentine, notre chasseuse de sons, est partie à la rencontre des élèves et des organisateurs de ce congrès scientifique ouvert aux plus jeunes. Écoutons-les.</p>
<h3><span style="color: #008000"><strong>1. Avant de s&rsquo;envoler dans l&rsquo;espace, on s&rsquo;entraine dur !<br />
</strong></span></h3>
<p>Commençons cette balade avec les « congressistes en herbe », qui nous expliquent leurs thèmes de recherche (la fusée <i>Soyouz</i>, l’entraînement des astronautes sur Terre, le ravitaillement et les déchets de la <i>Station spatiale internationale</i>) et leur trac avant les présentations orales.</p>
<h3><div class="outline"><span id="playpause_wrap_mp3j_0" class="wrap_inline_mp3j" style="font-weight:700;"><span class="group_wrap"><span class="bars_mp3j"><span class="loadB_mp3j" id="load_mp3j_0"></span><span class="posbarB_mp3j" id="posbar_mp3j_0"></span></span><span class="T_mp3j" id="T_mp3j_0"></span><span class="indi_mp3j" id="statusMI_0"></span></span><span class="buttons_mp3j" id="playpause_mp3j_0">&nbsp;</span><span class="vol_mp3j" id="vol_mp3j_0"></span></span></div></h3>
<p>Nathan nous parle de l’entraînement des astronautes sur Terre. Il nous explique qu’il y a une chaise fixée à une grande roue qui balance dans tous les sens. Le but de cette manœuvre est d’écrire son prénom sur un calepin. Il y a aussi la piscine et la centrifugeuse. Eliott nous parle du ravitaillement et des déchets de la station spatiale. Les astronautes ont besoin de manger et de boire, et les machines ont besoin d’être ravitaillées.</p>
<h3><span style="color: #008000"><strong>2. Comment ça se passe la haut ?<br />
</strong></span></h3>
<p>Continuons avec les élèves de l’école Château d’Ancely, qui nous présentent leurs recherches sur la <i>Station spatiale internationale</i>, plus connue sous le nom <i>ISS</i> (en anglais, <i>International Space Station</i>).</p>
<h3><div class="outline"><span id="playpause_wrap_mp3j_1" class="wrap_inline_mp3j" style="font-weight:700;"><span class="group_wrap"><span class="bars_mp3j"><span class="loadB_mp3j" id="load_mp3j_1"></span><span class="posbarB_mp3j" id="posbar_mp3j_1"></span></span><span class="T_mp3j" id="T_mp3j_1"></span><span class="indi_mp3j" id="statusMI_1"></span></span><span class="buttons_mp3j" id="playpause_mp3j_1">&nbsp;</span><span class="vol_mp3j" id="vol_mp3j_1"></span></span></div></h3>
<p>Ils nous expliquent que l’ISS est composé de plusieurs laboratoires de recherche où des expériences scientifiques sont effectuées. Le premier module a été envoyé dans l’espace en 1998, alors que le projet avait commencé en 1983. Dix pays européens ont participé à la construction de l’ISS. Il a fallu 15 ans pour achever sa construction.</p>
<h3><span style="color: #008000"><strong>3. Après avoir parlé, on se sent plus fort !<br />
</strong></span></h3>
<p>Et terminons avec avec Christophe Chaffardon, le responsable des questions d’éducation à la Cité de l’espace.</p>
<h3><div class="outline"><span id="playpause_wrap_mp3j_2" class="wrap_inline_mp3j" style="font-weight:700;"><span class="group_wrap"><span class="bars_mp3j"><span class="loadB_mp3j" id="load_mp3j_2"></span><span class="posbarB_mp3j" id="posbar_mp3j_2"></span></span><span class="T_mp3j" id="T_mp3j_2"></span><span class="indi_mp3j" id="statusMI_2"></span></span><span class="buttons_mp3j" id="playpause_mp3j_2">&nbsp;</span><span class="vol_mp3j" id="vol_mp3j_2"></span></span></div></h3>
<p>Il nous explique que le but du jeu de ces conférences est d&rsquo;échanger des informations avec d’autres élèves et de s&rsquo;exprimer devant un groupe de personnes. Cela permet de développer l’estime de soi.</p>
<h2><strong>Le diaporama sur les exposés :</strong></h2>

<a href='http://1jour1actu.com/science/iss-station-spatiale/attachment/expo-ravitaillement/' title='expo-ravitaillement'><img width="190" height="190" src="http://1jour1actu.com/wp-content/uploads/expo-ravitaillement-190x190.jpg" class="attachment-thumbnail" alt="L&#039;exposé sur le ravitaillement à bord de la station spatiale." /></a>
<a href='http://1jour1actu.com/science/iss-station-spatiale/attachment/ravitaillement-iss/' title='ravitaillement-iss'><img width="190" height="190" src="http://1jour1actu.com/wp-content/uploads/ravitaillement-iss-190x190.jpg" class="attachment-thumbnail" alt="Le repas des astronautes à bord de l&#039;ISS !" /></a>
<a href='http://1jour1actu.com/science/iss-station-spatiale/attachment/claudie-haignere-2/' title='Claudie Haignere'><img width="190" height="190" src="http://1jour1actu.com/wp-content/uploads/Claudie-Haignere-190x190.jpg" class="attachment-thumbnail" alt="L&#039;astronaute française Claudie Haigneré." /></a>
<a href='http://1jour1actu.com/science/iss-station-spatiale/attachment/expo-spationaute/' title='expo-spationaute'><img width="190" height="190" src="http://1jour1actu.com/wp-content/uploads/expo-spationaute-190x190.jpg" class="attachment-thumbnail" alt="L&#039;exposé sur la tenue des astronautes." /></a>
<a href='http://1jour1actu.com/science/iss-station-spatiale/attachment/expo-assemblage-iss/' title='expo-assemblage-iss'><img width="190" height="190" src="http://1jour1actu.com/wp-content/uploads/expo-assemblage-iss-190x190.jpg" class="attachment-thumbnail" alt="L&#039;exposé sur la Station Spatiale (ISS)." /></a>
<a href='http://1jour1actu.com/science/iss-station-spatiale/attachment/congres-salle/' title='congres-salle'><img width="190" height="190" src="http://1jour1actu.com/wp-content/uploads/congres-salle-190x190.jpg" class="attachment-thumbnail" alt="La salle de congrès de la Cité de l&#039;espace à Toulouse avec les jeunes experts." /></a>

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  <h2>Sur le congrès scientifique des enfants</h2>
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            <div class='mtq_question mtq_scroll_item-2' id='mtq_question-1-2'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-2' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-2' class='mtq_question_text'><span>Combien d'enfants ont participé au Congrès ?</span></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-2' onclick='mtq_button_click(1,1,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-2' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-2' class='mtq_answer_text'>Mille quatre cents.</div></td></tr><tr id='mtq_row-1-2-2' onclick='mtq_button_click(1,2,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-2' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-2' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-2' class='mtq_answer_text'>Cent quarante.</div></td></tr><tr id='mtq_row-1-3-2' onclick='mtq_button_click(1,3,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-2' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-2' class='mtq_answer_text'>Quatorze.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-2' id='mtq_question-2-2'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-2' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-2' class='mtq_question_text'><span>Quel est le but ultime du Congrès pour les enfants ?</span></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-2' onclick='mtq_button_click(2,1,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-2' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-2' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-2' class='mtq_answer_text'>Développer l'estime de soi.</div></td></tr><tr id='mtq_row-2-2-2' onclick='mtq_button_click(2,2,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-2' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-2' class='mtq_answer_text'>Développer les connaissances scientifiques.</div></td></tr><tr id='mtq_row-2-3-2' onclick='mtq_button_click(2,3,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-2' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-2' class='mtq_answer_text'>Développer les compétences à l'oral.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-2' id='mtq_question-3-2'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-2' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-2' class='mtq_question_text'><span>Qui est la marraine du Congrès ?</span></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-2' onclick='mtq_button_click(3,1,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-1-2' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 3, Choice 1'>A</div><div id='mtq_marker-3-1-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-1-2' class='mtq_answer_text'>Marie Curie.</div></td></tr><tr id='mtq_row-3-2-2' onclick='mtq_button_click(3,2,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-2-2' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 3, Choice 2'>B</div><div id='mtq_marker-3-2-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-2-2' class='mtq_answer_text'>Nicole Abar.</div></td></tr><tr id='mtq_row-3-3-2' onclick='mtq_button_click(3,3,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-3-2' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 3, Choice 3'>C</div><div id='mtq_marker-3-3-2' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-3-2' class='mtq_answer_text'>Claudie Haigneré.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-2' id='mtq_question-4-2'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 4</div><div id='mtq_stamp-4-2' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-4-2' class='mtq_question_text'><span>Quel est le deuxième thème présenté par les enfants ?</span></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-4-1-2' onclick='mtq_button_click(4,1,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-1-2' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 4, Choice 1'>A</div><div id='mtq_marker-4-1-2' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-1-2' class='mtq_answer_text'>L'entraînement des astronautes sur Terre.</div></td></tr><tr id='mtq_row-4-2-2' onclick='mtq_button_click(4,2,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-2-2' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 4, Choice 2'>B</div><div id='mtq_marker-4-2-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-2-2' class='mtq_answer_text'>La fusée Soyouz.</div></td></tr><tr id='mtq_row-4-3-2' onclick='mtq_button_click(4,3,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-3-2' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 4, Choice 3'>C</div><div id='mtq_marker-4-3-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-3-2' class='mtq_answer_text'>Les déchets de la station spatiale internationale.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-2' id='mtq_question-5-2'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 5</div><div id='mtq_stamp-5-2' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-5-2' class='mtq_question_text'><span>Que signifie ISS?</span></div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-5-1-2' onclick='mtq_button_click(5,1,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-1-2' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 5, Choice 1'>A</div><div id='mtq_marker-5-1-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-1-2' class='mtq_answer_text'>Incredible Space Station.</div></td></tr><tr id='mtq_row-5-2-2' onclick='mtq_button_click(5,2,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-2-2' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 5, Choice 2'>B</div><div id='mtq_marker-5-2-2' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-2-2' class='mtq_answer_text'>Intelegency Space Station. </div></td></tr><tr id='mtq_row-5-3-2' onclick='mtq_button_click(5,3,2)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-3-2' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 5, Choice 3'>C</div><div id='mtq_marker-5-3-2' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-3-2' class='mtq_answer_text'>International Space Station.</div></td></tr></table></div>            <div id="mtq_results_request-2" class="mtq_results_request mtq_scroll_item-2">
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			<wfw:commentRss>http://1jour1actu.com/science/iss-station-spatiale/feed/</wfw:commentRss>
		<slash:comments>6</slash:comments>
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 <pubDate>Thu, 06 Jun 2013 11:24:40 +0000 UTC</pubDate>  
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		<item>
		<title>Où part le voilier Tara ?</title>
		<link>http://1jour1actu.com/science/ou-part-le-voilier-tara/</link>
		<comments>http://1jour1actu.com/science/ou-part-le-voilier-tara/#comments</comments>
		<pubDate>Sun, 02 Jun 2013 08:22:01 +0000</pubDate>
		<dc:creator>Stephanie Biju</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=138294</guid>
		<description><![CDATA[2 juin 2013<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/tara-300x164.jpg" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir le voilier Tara qui réalise des expéditions scientifiques. (© F. Latreille - TaraExpeditions)" /></p><p><strong>Tara est un voilier qui, depuis dix ans, réalise des expéditions scientifiques pour étudier les effets du changement climatique sur les océans du monde. Au cours des sept prochains mois, il va réaliser un tour complet du pôle Nord. Sa mission : récolter du plancton et mesurer la pollution humaine sur la banquise.</strong></p>
 <a href="http://1jour1actu.com/science/ou-part-le-voilier-tara/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	2 juin 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/tara-300x164.jpg" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir le voilier Tara qui réalise des expéditions scientifiques. (© F. Latreille - TaraExpeditions)" /></p><h2><strong>Pourquoi en parle-t-on ? </strong></h2>
<p>Parce que le voilier <em>Tara</em> est parti dimanche 19 mai de Lorient, en Bretagne, pour une nouvelle expédition scientifique. Celle-ci va se dérouler dans l’océan Arctique, pendant sept mois.</p>
<h2><strong>L&rsquo;actu du jour :</strong></h2>
<h3><span style="color: #800080"><strong>C’est quoi <em>Tara</em> ?</strong> </span></h3>
<p><em>Tara</em> est une goélette : un voilier dont les deux mâts sont de la même hauteur. C’est le plus grand voilier polaire français. Il a été conçu pour résister à la glace. S’il se retrouve emprisonné par la banquise, sa coque ne cassera pas. Ce qui va bien lui servir pour sa nouvelle mission dans l’océan Arctique !</p>
<p>Car <em>Tara</em> est surtout un voilier scientifique avec à son bord plein d’appareils de collecte, des instruments de mesure, des microscopes… Un vrai laboratoire flottant.</p>
<p>En dix ans, <em>Tara</em> a réalisé huit expéditions autour du monde et étudié le <span style="color: #008000"><strong>plancton</strong></span> de tous les océans. Reste celui de l’océan Arctique.</p>
<div id="attachment_138307" class="wp-caption alignnone" style="width: 310px"><a href="http://1jour1actu.com/wp-content/uploads/tara2.jpg"><img class="size-medium wp-image-138307" alt="Le voilier tara brisant la glace. (© F. Latreille - TaraExpeditions)" src="http://1jour1actu.com/wp-content/uploads/tara2-300x198.jpg" width="300" height="198" /></a><p class="wp-caption-text">Le voilier tara brisant la glace. (© F. Latreille &#8211; TaraExpeditions)</p></div>
<h3><span style="color: #800080"><strong>Quel trajet va effectuer <em>Tara</em> ?</strong></span></h3>
<p>Le bateau va parcourir 25 000 km (soit à peu près cinq fois la distance entre la France et les États-Unis), pour faire le tour du pôle Nord. Ce sera possible grâce à la fonte d’été de la glace qui va ouvrir des passages dans la banquise. <em>Tara</em> va passer par la Norvège, la Russie, le Canada, l’Alaska et le Groenland. Jusqu’à présent, seulement deux voiliers ont fait le tour de l’Arctique, une région où la navigation est difficile à cause des tempêtes, du froid (jusqu’à – 10 °C), du brouillard et aussi des plaques de glace qui dérivent.</p>
<h3><span style="color: #800080"><strong>Qui est à bord et en quoi va consister cette mission ?</strong></span></h3>
<p>Pendant sept mois, cinquante personnes vont se relayer à bord de <em>Tara</em>. Il y aura en permanence quatorze personnes sur le bateau. Le capitaine, des mécaniciens, un cuisinier… mais aussi des océanographes (ce sont des spécialistes des océans), des biologistes marins et d’autres scientifiques.</p>
<p>Leur travail va consister à recueillir des échantillons d’eau et de plancton tout au bord de la banquise.<br />
Les scientifiques vont également observer les traces, même minuscules, de plastiques et des autres polluants présents dans cette région du Grand Nord.</p>
<h3><span style="color: #800080"><strong>Quel est le but de cette expédition ?</strong></span></h3>
<p>Toutes les expéditions de <em>Tara</em> ont un objectif écologique. Elles consistent à étudier l’effet du réchauffement climatique sur les océans. Cette nouvelle mission au pôle Nord va également permettre de mieux connaître l’impact de l’activité humaine sur la banquise et de mesurer la pollution qui arrive jusque dans cette région pourtant très éloignée.</p>
<h2><strong>Le dico du jour :</strong></h2>
<p><strong><span style="color: #008000">Plancton</span> :</strong> Le plancton est constitué de minuscules êtres vivants qui vivent dans les mers et océans. Il peut s’agir d’animaux (comme les larves de poissons ou de crustacés) ou de végétaux (des algues microscopiques). Le plancton est à la base de la chaîne alimentaire du milieu aquatique. Par exemple, le plancton est mangé par la méduse qui est elle-même mangée par la tortue, et la tortue, elle, est mangée par le requin…</p>
<h2><strong>Le quiz du jour :</strong></h2>
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  <h2>Sur le voilier Tara</h2>
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            <div class='mtq_question mtq_scroll_item-3' id='mtq_question-1-3'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-3' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-3' class='mtq_question_text'>Quel type de bateau est Tara ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-3' onclick='mtq_button_click(1,1,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-3' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-3' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-3' class='mtq_answer_text'>Une goélette.</div></td></tr><tr id='mtq_row-1-2-3' onclick='mtq_button_click(1,2,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-3' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-3' class='mtq_answer_text'>Un paquebot.</div></td></tr><tr id='mtq_row-1-3-3' onclick='mtq_button_click(1,3,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-3' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-3' class='mtq_answer_text'>Un catamaran.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-3' id='mtq_question-2-3'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-3' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-3' class='mtq_question_text'>Où part Tara pour cette nouvelle expédition ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-3' onclick='mtq_button_click(2,1,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-3' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-3' class='mtq_answer_text'>Au pôle Sud.</div></td></tr><tr id='mtq_row-2-2-3' onclick='mtq_button_click(2,2,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-3' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-3' class='mtq_answer_text'>A l'Equateur.</div></td></tr><tr id='mtq_row-2-3-3' onclick='mtq_button_click(2,3,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-3' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-3' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-3' class='mtq_answer_text'>Au pôle Nord.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-3' id='mtq_question-3-3'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-3' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-3' class='mtq_question_text'>Combien de km Tara va-t-elle parcourir ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-3' onclick='mtq_button_click(3,1,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-1-3' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 3, Choice 1'>A</div><div id='mtq_marker-3-1-3' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-1-3' class='mtq_answer_text'>Vingt-cinq mille.</div></td></tr><tr id='mtq_row-3-2-3' onclick='mtq_button_click(3,2,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-2-3' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 3, Choice 2'>B</div><div id='mtq_marker-3-2-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-2-3' class='mtq_answer_text'>Deux cent cinquante mille.</div></td></tr><tr id='mtq_row-3-3-3' onclick='mtq_button_click(3,3,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-3-3' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 3, Choice 3'>C</div><div id='mtq_marker-3-3-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-3-3' class='mtq_answer_text'>Deux mille cinq cents.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-3' id='mtq_question-4-3'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 4</div><div id='mtq_stamp-4-3' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-4-3' class='mtq_question_text'>Quel est le but des expéditions de Tara ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-4-1-3' onclick='mtq_button_click(4,1,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-1-3' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 4, Choice 1'>A</div><div id='mtq_marker-4-1-3' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-1-3' class='mtq_answer_text'>Etudier l'effet du réchauffement climatique sur les océans.</div></td></tr><tr id='mtq_row-4-2-3' onclick='mtq_button_click(4,2,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-2-3' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 4, Choice 2'>B</div><div id='mtq_marker-4-2-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-2-3' class='mtq_answer_text'>Etudier l'effet du réchauffement climatique sur les déserts.
</div></td></tr><tr id='mtq_row-4-3-3' onclick='mtq_button_click(4,3,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-3-3' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 4, Choice 3'>C</div><div id='mtq_marker-4-3-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-3-3' class='mtq_answer_text'>Etudier l'effet du réchauffement climatique sur les montagnes.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-3' id='mtq_question-5-3'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 5</div><div id='mtq_stamp-5-3' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-5-3' class='mtq_question_text'>Combien y a-t-il de personnes sur le bateau ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-5-1-3' onclick='mtq_button_click(5,1,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-1-3' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 5, Choice 1'>A</div><div id='mtq_marker-5-1-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-1-3' class='mtq_answer_text'>50.</div></td></tr><tr id='mtq_row-5-2-3' onclick='mtq_button_click(5,2,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-2-3' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 5, Choice 2'>B</div><div id='mtq_marker-5-2-3' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-2-3' class='mtq_answer_text'>34.</div></td></tr><tr id='mtq_row-5-3-3' onclick='mtq_button_click(5,3,3)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-3-3' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 5, Choice 3'>C</div><div id='mtq_marker-5-3-3' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-3-3' class='mtq_answer_text'>14.</div></td></tr></table></div>            <div id="mtq_results_request-3" class="mtq_results_request mtq_scroll_item-3">
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]]></content:encoded>
			<wfw:commentRss>http://1jour1actu.com/science/ou-part-le-voilier-tara/feed/</wfw:commentRss>
		<slash:comments>16</slash:comments>
	<enclosure url='http://1jour1actu.com/wp-content/uploads/tara.jpg' length ='70789'  type='image/jpg' /> 
 <pubDate>Sun, 02 Jun 2013 10:22:01 +0000 UTC</pubDate>  
	</item>
		<item>
		<title>C’est quoi, cette drôle de cellule ?</title>
		<link>http://1jour1actu.com/science/cellule-souche/</link>
		<comments>http://1jour1actu.com/science/cellule-souche/#comments</comments>
		<pubDate>Fri, 24 May 2013 08:37:31 +0000</pubDate>
		<dc:creator>Muriel Valin</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=137766</guid>
		<description><![CDATA[24 mai 2013<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/cellule-souche-300x164.jpg" class="attachment-medium wp-post-image" alt="Toutes ces petites billes sont des nouvelles cellules qui viennent d’être fabriquées par des chercheurs américains. On les appelle des cellules souches embryonnaires et elles vont pouvoir servir à fabriquer des organes tout neufs, pour soigner des malades. (© OHSU, Shoukhrat Mitalipov)" /></p><p><strong>Voici un événement scientifique qui va peut-être révolutionner la médecine ! Des chercheurs ont réussi à fabriquer cette petite boule que l’on appelle une « cellule souche embryonnaire ». À première vue, cela te paraît sûrement bizarre. Pourtant, c’est une étape ultra-importante en science. On t’explique pourquoi.</strong></p>
 <a href="http://1jour1actu.com/science/cellule-souche/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	24 mai 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/cellule-souche-300x164.jpg" class="attachment-medium wp-post-image" alt="Toutes ces petites billes sont des nouvelles cellules qui viennent d’être fabriquées par des chercheurs américains. On les appelle des cellules souches embryonnaires et elles vont pouvoir servir à fabriquer des organes tout neufs, pour soigner des malades. (© OHSU, Shoukhrat Mitalipov)" /></p><h2><b>Pourquoi en parle-t-on ?</b></h2>
<p>Parce que des chercheurs américains viennent d’annoncer qu’ils ont réussi cette expérience pour la toute première fois. Jusqu’ici, plusieurs équipes avaient déjà essayé dans le monde, mais toutes les tentatives avaient échoué.</p>
<h2><b>L’actu du jour :</b></h2>
<p>Tu t’es sûrement déjà demandé comment ton corps s’était fabriqué. Comment tes os sont apparus ? Comment ta peau s’est mise à recouvrir tes organes ? La réponse n’est pas simple mais, avant la naissance, il existe des mini-éléments dans notre corps qui sont responsables de toutes ces missions.</p>
<p>On les appelle les « <a title="mot du jour : cellule" href="#motDuJourContainer"><strong>cellules souches embryonnaires</strong> </a>» parce qu’elles viennent de « l’embryon », c’est-à-dire du bébé au tout début de sa formation.</p>
<p>Ces minuscules billes ont la capacité de fabriquer tout le corps humain : notre cœur, nos pieds, nos muscles, notre peau&#8230; Et aujourd’hui, c’est justement l’un de ces spécimens que les chercheurs ont réussi à produire en laboratoire.</p>
<h3><span style="color: #800080"><b>Pourquoi ces cellules souches embryonnaires sont-elles si importantes en médecine ?</b></span></h3>
<p>Parce qu’elles ont des <strong>superpouvoirs</strong> ! Elles sont capables de fabriquer n’importe quel organe de notre corps. Par conséquent, on peut aussi les utiliser pour soigner des maladies. Ainsi, si un morceau de cœur ou un morceau de foie est abîmé, on peut demander à ces cellules de fabriquer un nouvel organe en parfaite santé et remplacer celui qui ne fonctionne plus.</p>
<p>C’est pour cette raison que les médecins considèrent que les cellules souches embryonnaires sont très prometteuses. Ils pensent par exemple qu’elles pourront un jour nous aider à soigner des maladies comme la sclérose en plaque ou les maladies du cœur que l’on n’arrive pas encore à traiter.</p>
<h3><span style="color: #800080"><b>Mais comment les chercheurs ont-ils fait pour fabriquer cette fameuse cellule ?</b></span></h3>
<p>Ils ont utilisé une technique complexe qu’on appelle le «<span style="color: #008000"> <strong>clonage thérapeutique</strong></span> ».</p>
<p>En clair, cette solution consiste à fabriquer de nouvelles cellules toutes neuves, prêtes à construire des organes, en partant de cellules plus anciennes déjà présentes chez une personne malade.</p>
<p>L’exploit de cette équipe de chercheurs est donc d’avoir réussi à fabriquer une sorte de réservoir de cellules qui pourront un jour fabriquer des organes tout neufs. Attention, pour l’instant, on n’en est qu’au tout début et les médecins doivent encore travailler pour arriver à fabriquer ces fameux organes en bonne santé. Mais cette première étape est déjà énorme !</p>
<h2><strong>Le dico du jour :</strong></h2>
<p><span style="color: #008000"><strong>Clonage thérapeutique</strong></span> : « Cloner » signifie « recopier à l’identique » et « thérapeutique » signifie « pour soigner ».</p>
<h2><strong>Le quiz du jour :</strong></h2>
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  <h2>Sur les cellules souches </h2>
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            <div class='mtq_question mtq_scroll_item-4' id='mtq_question-1-4'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-4' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-4' class='mtq_question_text'>Que signifie l'adjectif  "thérapeutique" ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-4' onclick='mtq_button_click(1,1,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-4' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-4' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-4' class='mtq_answer_text'>"Pour corriger"</div></td></tr><tr id='mtq_row-1-2-4' onclick='mtq_button_click(1,2,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-4' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-4' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-4' class='mtq_answer_text'>"Pour soigner"</div></td></tr><tr id='mtq_row-1-3-4' onclick='mtq_button_click(1,3,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-4' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-4' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-4' class='mtq_answer_text'>"Pour alerter"</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-4' id='mtq_question-2-4'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-4' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-4' class='mtq_question_text'>À quoi va servir cette découverte ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-4' onclick='mtq_button_click(2,1,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-4' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-4' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-4' class='mtq_answer_text'>À stopper le vieillissement</div></td></tr><tr id='mtq_row-2-2-4' onclick='mtq_button_click(2,2,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-4' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-4' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-4' class='mtq_answer_text'>À fabriquer des organes sains</div></td></tr><tr id='mtq_row-2-3-4' onclick='mtq_button_click(2,3,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-4' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-4' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-4' class='mtq_answer_text'>À fabriquer du sang neuf</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-4' id='mtq_question-3-4'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-4' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-4' class='mtq_question_text'>Qu'a-t-on utilisé pour fabriquer ces cellules ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-4' onclick='mtq_button_click(3,1,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-1-4' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 3, Choice 1'>A</div><div id='mtq_marker-3-1-4' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-1-4' class='mtq_answer_text'>La thérapie de groupe cellulaire</div></td></tr><tr id='mtq_row-3-2-4' onclick='mtq_button_click(3,2,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-2-4' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 3, Choice 2'>B</div><div id='mtq_marker-3-2-4' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-2-4' class='mtq_answer_text'>Le clonage thérapeutique </div></td></tr><tr id='mtq_row-3-3-4' onclick='mtq_button_click(3,3,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-3-4' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 3, 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id='mtq_answer_text-4-1-4' class='mtq_answer_text'>Des reins </div></td></tr><tr id='mtq_row-4-2-4' onclick='mtq_button_click(4,2,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-2-4' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 4, Choice 2'>B</div><div id='mtq_marker-4-2-4' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-2-4' class='mtq_answer_text'>De l'embryon</div></td></tr><tr id='mtq_row-4-3-4' onclick='mtq_button_click(4,3,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-3-4' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 4, Choice 3'>C</div><div id='mtq_marker-4-3-4' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-3-4' class='mtq_answer_text'>Du corps adulte</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-4' id='mtq_question-5-4'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 5</div><div id='mtq_stamp-5-4' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-5-4' class='mtq_question_text'>Quelle est la nationalité des chercheurs ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-5-1-4' onclick='mtq_button_click(5,1,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-1-4' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 5, Choice 1'>A</div><div id='mtq_marker-5-1-4' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-1-4' class='mtq_answer_text'>Française</div></td></tr><tr id='mtq_row-5-2-4' onclick='mtq_button_click(5,2,4)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-2-4' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 5, 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			<wfw:commentRss>http://1jour1actu.com/science/cellule-souche/feed/</wfw:commentRss>
		<slash:comments>20</slash:comments>
	<enclosure url='http://1jour1actu.com/wp-content/uploads/cellule-souche.jpg' length ='130138'  type='image/jpg' /> 
 <pubDate>Fri, 24 May 2013 10:37:31 +0000 UTC</pubDate>  
	</item>
		<item>
		<title>Une machine à capturer les astéroïdes</title>
		<link>http://1jour1actu.com/science/une-machine-a-capturer-les-asteroides/</link>
		<comments>http://1jour1actu.com/science/une-machine-a-capturer-les-asteroides/#comments</comments>
		<pubDate>Tue, 30 Apr 2013 12:24:35 +0000</pubDate>
		<dc:creator>Catherine MENGUY</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=136592</guid>
		<description><![CDATA[30 avril 2013<p></p><p><img width="300" height="234" src="http://1jour1actu.com/wp-content/uploads/asteroide-300x234.jpg" class="attachment-medium wp-post-image" alt="L’astéroïde sera capturé à l’aide d’un vaisseau robot. Celui-ci déploiera une sorte de sac géant pour emprisonner le rocher qui sera ensuite remorqué à proximité de la Terre pour y être étudié. Photo : Rick Sternbach © KISS" /></p><p><strong>Tu te souviens sans doute de cet astéroïde qui s’est désintégré au-dessus de Tcheliabinsk, en Russie, le 15 février dernier, faisant 1 500 blessés. Cet incident très rare montre qu’il faut prendre au sérieux ces blocs qui tournent autour de la Terre et menacent de s’écraser sur notre planète. La Nasa vient de lancer un projet visant à mieux connaître les astéroïdes, ceci afin de s’en protéger, voire, même, de les utiliser.</strong></p>
 <a href="http://1jour1actu.com/science/une-machine-a-capturer-les-asteroides/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	30 avril 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="234" src="http://1jour1actu.com/wp-content/uploads/asteroide-300x234.jpg" class="attachment-medium wp-post-image" alt="L’astéroïde sera capturé à l’aide d’un vaisseau robot. Celui-ci déploiera une sorte de sac géant pour emprisonner le rocher qui sera ensuite remorqué à proximité de la Terre pour y être étudié. Photo : Rick Sternbach © KISS" /></p><h2>Pourquoi on en parle ?</h2>
<p>Parce que le président américain Barack Obama, en personne, vient de demander à l’Agence spatiale américaine de capturer un astéroïde, puis de le ramener vers la Terre afin de l’étudier.</p>
<h2>L’@ctu du jour</h2>
<h3><span style="color: #800080">Le décor</span></h3>
<p>Il y a des milliards d’astéroïdes dans l’univers. Parmi eux, on en compte environ 10 000, qui tournent sur une <strong>orbite</strong> assez proche de celle de la Terre. Certains sont tout petits, d’autres sont énormes. Si l’un de ces <strong>blocs géants</strong> s’écrasait au sol, il pourrait réduire à néant toute vie sur la planète bleue.</p>
<h3><span style="color: #800080">L’idée générale</span></h3>
<p>Dans un avenir proche, les scientifiques espèrent arriver à dévier la trajectoire d’un astéroïde qui se rapprocherait dangereusement de la Terre. Mais pour mettre au point cette technologie, il faut d’abord approcher l’un de ces blocs célestes pour en connaître la nature et le fonctionnement.</p>
<h3><span style="color: #800080">Le scénario</span></h3>
<p>L’idée est de poursuivre puis de saisir un astéroïde, ni trop petit ni trop gros, à l’aide d’un vaisseau robot.</p>
<p>En regardant cette vidéo, tu comprendras mieux comment l’Agence spatiale américaine envisage de capturer et de remorquer un astéroïde.<p><a href="http://1jour1actu.com/science/une-machine-a-capturer-les-asteroides/"><em>Cliquer ici pour voir la vidéo.</em></a></p></p>
<p>Au moment de la capture, il sera emprisonné dans un sac accroché au vaisseau, comme dans un filet à papillons géant, puis ramené à proximité de la Terre. Là, les <strong>astronautes</strong> pourront venir l’étudier à loisir. Le trajet ne durera que quelques jours alors qu’il faudrait des jours de navigation dans l’espace, s’ils s’étaient directement lancés à sa poursuite.</p>
<h3><span style="color: #339966">Mission n° 1</span></h3>
<p>Les chercheurs espèrent pouvoir attraper et explorer un astéroïde en <strong>2025</strong>. Leur première tâche sera de l’étudier afin de développer des techniques pour le détourner de la Terre.</p>
<h3><span style="color: #339966">Mission n° 2</span></h3>
<p>Les astéroïdes renferment des trésors : de l’eau mais aussi du fer, du nickel, du cobalt, du platine… Autant de minéraux utilisés par l’homme dans l’industrie. En attrapant un astéroïde, les scientifiques vont pouvoir réfléchir à la manière d’exploiter ces <strong>matériaux précieux.</strong></p>
<h3><span style="color: #339966">Mission n° 3</span></h3>
<p>Les hommes devraient pouvoir se rendre sur <strong>Mars</strong> vers 2030. Les astéroïdes serviraient alors d’escale entre la Terre et la <strong>planète rouge</strong>. Les astronautes pourraient y faire le plein en eau et en ressources énergétiques avant le grand envol vers Mars. Capturer un astéroïde permettrait donc aussi de réfléchir à la façon de repousser les frontières du monde connu.</p>
<h2> Le quiz du jour :</h2>
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            <div class='mtq_question mtq_scroll_item-5' id='mtq_question-1-5'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-5' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-5' class='mtq_question_text'>Où est tombé récemment un astéroïde qui a fait plusieurs dizaines de blessés ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-5' onclick='mtq_button_click(1,1,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-5' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-5' class='mtq_answer_text'>Au Canada</div></td></tr><tr id='mtq_row-1-2-5' onclick='mtq_button_click(1,2,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-5' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-5' class='mtq_answer_text'>En Ukraine</div></td></tr><tr id='mtq_row-1-3-5' onclick='mtq_button_click(1,3,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-5' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-5' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-5' class='mtq_answer_text'>En Russie</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-5' id='mtq_question-2-5'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-5' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-5' class='mtq_question_text'>La Nasa est l’Agence spatiale…</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-5' onclick='mtq_button_click(2,1,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-5' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-5' class='mtq_answer_text'>chinoise</div></td></tr><tr id='mtq_row-2-2-5' onclick='mtq_button_click(2,2,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-5' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-5' class='mtq_answer_text'>russe</div></td></tr><tr id='mtq_row-2-3-5' onclick='mtq_button_click(2,3,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-5' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-5' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-5' class='mtq_answer_text'>américaine</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-5' id='mtq_question-3-5'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-5' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-5' class='mtq_question_text'>Combien d’astéroïdes tournent autour de la Terre (approximativement) :</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-5' onclick='mtq_button_click(3,1,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-1-5' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 3, Choice 1'>A</div><div id='mtq_marker-3-1-5' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-1-5' class='mtq_answer_text'>10 000</div></td></tr><tr id='mtq_row-3-2-5' onclick='mtq_button_click(3,2,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-2-5' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 3, Choice 2'>B</div><div id='mtq_marker-3-2-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-2-5' class='mtq_answer_text'>1000</div></td></tr><tr id='mtq_row-3-3-5' onclick='mtq_button_click(3,3,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-3-5' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 3, Choice 3'>C</div><div id='mtq_marker-3-3-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-3-5' class='mtq_answer_text'>100 000</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-5' id='mtq_question-4-5'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 4</div><div id='mtq_stamp-4-5' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-4-5' class='mtq_question_text'>Les météorites enferment des trésors, mais lesquels ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-4-1-5' onclick='mtq_button_click(4,1,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-1-5' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 4, Choice 1'>A</div><div id='mtq_marker-4-1-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-1-5' class='mtq_answer_text'>Du pétrole</div></td></tr><tr id='mtq_row-4-2-5' onclick='mtq_button_click(4,2,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-2-5' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 4, Choice 2'>B</div><div id='mtq_marker-4-2-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-2-5' class='mtq_answer_text'>Des diamants</div></td></tr><tr id='mtq_row-4-3-5' onclick='mtq_button_click(4,3,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-3-5' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 4, Choice 3'>C</div><div id='mtq_marker-4-3-5' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-3-5' class='mtq_answer_text'>Des minéraux précieux


</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-5' id='mtq_question-5-5'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 5</div><div id='mtq_stamp-5-5' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-5-5' class='mtq_question_text'>L’expédition sur Mars est prévue pour quand ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-5-1-5' onclick='mtq_button_click(5,1,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-1-5' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 5, Choice 1'>A</div><div id='mtq_marker-5-1-5' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-1-5' class='mtq_answer_text'>2030</div></td></tr><tr id='mtq_row-5-2-5' onclick='mtq_button_click(5,2,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-2-5' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 5, Choice 2'>B</div><div id='mtq_marker-5-2-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-2-5' class='mtq_answer_text'>2019</div></td></tr><tr id='mtq_row-5-3-5' onclick='mtq_button_click(5,3,5)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-3-5' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 5, Choice 3'>C</div><div id='mtq_marker-5-3-5' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-3-5' class='mtq_answer_text'>2015</div></td></tr></table></div>            <div id="mtq_results_request-5" class="mtq_results_request mtq_scroll_item-5">
        Une fois terminé, cliquez sur le bouton ci-dessous. Tous les objets que vous n'avez pas complété seront marqués comme incorrect.        <span id="mtq_results_button-5" class='mtq_action_button mtq_css_button mtq_results_button'  onclick='mtq_get_results(5)'> <span class="mtq_results_text">
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		<slash:comments>22</slash:comments>
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 <pubDate>Tue, 30 Apr 2013 14:24:35 +0000 UTC</pubDate>  
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		<title>Happy birthday, l’ADN !</title>
		<link>http://1jour1actu.com/science/anniversaire-adn/</link>
		<comments>http://1jour1actu.com/science/anniversaire-adn/#comments</comments>
		<pubDate>Fri, 26 Apr 2013 09:44:20 +0000</pubDate>
		<dc:creator>Muriel Valin</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=136248</guid>
		<description><![CDATA[26 avril 2013<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/ADN-300x164.jpg" class="attachment-medium wp-post-image" alt="Cette double hélice est de l’ADN. Elle est composée de barreaux qui sont chacun formés de deux éléments chimiques, des « nucléotides ». Chaque gène est un morceau d’ADN. (© zhijian Huang/istockphoto)" /></p><p><strong>Regarde cette splendide hélice. Ce n’est pas une jolie guirlande. Non, c’est un brin d’ADN, c’est-à-dire une ministructure que l’on trouve à l’intérieur de notre corps, en milliards d’exemplaires. Cette semaine, on fête l’anniversaire de sa découverte. Une vraie révolution en génétique et en sciences en général ! On t’explique pourquoi.</strong></p>
 <a href="http://1jour1actu.com/science/anniversaire-adn/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	26 avril 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/ADN-300x164.jpg" class="attachment-medium wp-post-image" alt="Cette double hélice est de l’ADN. Elle est composée de barreaux qui sont chacun formés de deux éléments chimiques, des « nucléotides ». Chaque gène est un morceau d’ADN. (© zhijian Huang/istockphoto)" /></p><h2><strong>Pourquoi en parle-t-on ?</strong></h2>
<p>Parce qu’il y a 60 ans, le jeudi 25 avril 1953, deux chercheurs ont découvert cette <strong>structure en double hélice</strong> de l’ADN.</p>
<h2><strong>L’@ctu du jour :</strong></h2>
<p>Quand tes grands-parents étaient jeunes, il s’est passé un événement scientifique incroyable. Le Britannique Francis Crick et l’Américain James Watson ont découvert une double hélice présente dans toutes les cellules de notre corps.</p>
<p>À l’époque, personne ne se rendait vraiment compte de l’importance de cette trouvaille. Sauf les inventeurs eux-mêmes… La preuve : Crick avait écrit une lettre à son fils, Michael, qui avait 12 ans, en lui disant : « Cher Michael, Jim Watson et moi, nous avons probablement fait la plus importante des découvertes. »</p>
<h3><span style="color: #800080"><strong>Qu’est-ce que c’est que cette découverte ?</strong></span></h3>
<p>En fait, depuis les années 1950, les chercheurs avaient bien compris que dans nos cellules il existait un petit élément, appelé « ADN » (comme « acide désoxyribonucléique »), qui servait à transmettre des informations des parents aux enfants, au moment de la naissance (la couleur des yeux, la longueur du nez…). Cette transmission se faisait par des petits morceaux d’ADN que l’on appelle des gènes. D’où le nom de <strong>« transmission génétique »</strong>.</p>
<p>Mais, le problème, c’est que tout le monde ignorait quelle était la forme de l’ADN et surtout son principe de fonctionnement dans notre corps. Watson et Crick, en 1953, ont réussi à découvrir grâce à des images prises avec des rayons X que cet élément avait une forme de double hélice ce qui a tout bouleversé.</p>
<h3><span style="color: #800080"><strong>Pourquoi cette découverte est une vraie révolution scientifique ?</strong></span></h3>
<p>Parce que en découvrant cette forme en double hélice, Watson et Crick ont réussi à expliquer comment l’ADN faisait des copies, de parents à enfants, et comment chacun d’entre nous avait un code d’information unique dans ses cellules. Pour cette découverte, les deux chercheurs ont reçu le prix Nobel de médecine en 1962, une vraie consécration !</p>
<p>Aujourd’hui, 60 ans plus tard, grâce aux travaux des deux chercheurs, les médecins et les biologistes ont pu faire d’énormes découvertes scientifiques, notamment en médecine, sur les maladies liées à l’ADN (les fameuses maladies génétiques). Bravo, Watson et Crick !</p>
<h2><strong>Le quiz du jour :</strong></h2>
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            <div class='mtq_question mtq_scroll_item-6' id='mtq_question-1-6'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-6' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-6' class='mtq_question_text'>Quelle est la nationalité de Watson et Crick ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-6' onclick='mtq_button_click(1,1,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-6' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-6' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-6' class='mtq_answer_text'>Britannique et Américaine.</div></td></tr><tr id='mtq_row-1-2-6' onclick='mtq_button_click(1,2,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-6' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-6' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-6' class='mtq_answer_text'>Américaine et Australienne.</div></td></tr><tr id='mtq_row-1-3-6' onclick='mtq_button_click(1,3,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-6' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-6' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-6' class='mtq_answer_text'>Britannique et Australienne.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-6' id='mtq_question-2-6'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-6' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-6' class='mtq_question_text'>À quoi ressemble l'ADN ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-6' onclick='mtq_button_click(2,1,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-6' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-6' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-6' class='mtq_answer_text'>À un double cube.</div></td></tr><tr id='mtq_row-2-2-6' onclick='mtq_button_click(2,2,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-6' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-6' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-6' class='mtq_answer_text'>À un ressort.</div></td></tr><tr id='mtq_row-2-3-6' onclick='mtq_button_click(2,3,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-6' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-6' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-6' class='mtq_answer_text'>À une double hélice.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-6' id='mtq_question-3-6'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-6' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-6' class='mtq_question_text'>Quel prix Watson et Crick ont-il reçu ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-6' onclick='mtq_button_click(3,1,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-1-6' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 3, Choice 1'>A</div><div id='mtq_marker-3-1-6' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-1-6' class='mtq_answer_text'>La Palme d'or.</div></td></tr><tr id='mtq_row-3-2-6' onclick='mtq_button_click(3,2,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-2-6' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 3, Choice 2'>B</div><div id='mtq_marker-3-2-6' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-2-6' class='mtq_answer_text'>Le prix Nobel.</div></td></tr><tr id='mtq_row-3-3-6' onclick='mtq_button_click(3,3,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-3-6' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 3, 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id='mtq_answer_text-4-1-6' class='mtq_answer_text'>À sa femme.</div></td></tr><tr id='mtq_row-4-2-6' onclick='mtq_button_click(4,2,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-2-6' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 4, Choice 2'>B</div><div id='mtq_marker-4-2-6' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-2-6' class='mtq_answer_text'>À son fils.</div></td></tr><tr id='mtq_row-4-3-6' onclick='mtq_button_click(4,3,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-3-6' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 4, Choice 3'>C</div><div id='mtq_marker-4-3-6' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-3-6' class='mtq_answer_text'>À ses parents.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-6' id='mtq_question-5-6'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 5</div><div id='mtq_stamp-5-6' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-5-6' class='mtq_question_text'>En quelle année l'ADN a-t-elle été découverte ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-5-1-6' onclick='mtq_button_click(5,1,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-1-6' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 5, Choice 1'>A</div><div id='mtq_marker-5-1-6' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-1-6' class='mtq_answer_text'>1952.</div></td></tr><tr id='mtq_row-5-2-6' onclick='mtq_button_click(5,2,6)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-2-6' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 5, 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			<wfw:commentRss>http://1jour1actu.com/science/anniversaire-adn/feed/</wfw:commentRss>
		<slash:comments>23</slash:comments>
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 <pubDate>Fri, 26 Apr 2013 11:44:20 +0000 UTC</pubDate>  
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		<title>Sidaction : mieux dépister pour mieux soigner</title>
		<link>http://1jour1actu.com/science/depistage-du-sida/</link>
		<comments>http://1jour1actu.com/science/depistage-du-sida/#comments</comments>
		<pubDate>Mon, 08 Apr 2013 10:38:21 +0000</pubDate>
		<dc:creator>Coline Arbouet</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=134399</guid>
		<description><![CDATA[8 avril 2013<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/sida-300x164.jpg" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir une femme qui allume une des bougies qui forment un ruban rouge. Ce ruban rouge symbolise la lutte contre le sida.( © AFP PHOTO / ALEXA STANKOVIC)" /></p><p><strong>Si tu as allumé la télé ce week-end, tu as sans doute vu affiché à l’écran un petit ruban rouge avec le numéro 110. Ce ruban rouge symbolise la lutte contre le sida, et 110, c’est le numéro du Sidaction, une manifestation qui a pour but de recueillir des dons pour la recherche contre le sida. Aujourd’hui, grâce cette recherche, on peut vivre avec cette maladie. Mais pour cela, il faut d’abord dépister le virus.  </strong></p>
 <a href="http://1jour1actu.com/science/depistage-du-sida/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	8 avril 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/sida-300x164.jpg" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir une femme qui allume une des bougies qui forment un ruban rouge. Ce ruban rouge symbolise la lutte contre le sida.( © AFP PHOTO / ALEXA STANKOVIC)" /></p><h2><b>Pourquoi parle-t-on du dépistage du sida ?</b></h2>
<p>Parce que le <strong>Sidaction</strong> a eu lieu du 5 au 7 avril. Pendant trois jours, les différentes chaînes de télé ont relayé des informations sur le <span style="color: #008000"><strong>sida</strong></span> pour sensibiliser sur cette maladie et permettre de faire avancer la recherche. En 2012, le Sidaction a permis de recueillir plus de 4 millions d’euros. Cet argent servira par exemple à apporter des soins aux malades, à payer des médecins en Afrique ou en Asie, à financer des recherches, etc.</p>
<h2><b>L’@ctu du jour : </b></h2>
<p>Le <strong>sida</strong>, on en entend beaucoup parler, mais c’est quoi exactement ?</p>
<p>Le sida est une maladie très grave qui <strong>affaiblit le système immunitaire</strong> du corps humain : celui-ci n’a plus assez de force pour se défendre contre les infections. Il est important de faire la différence entre la maladie du sida et le virus du sida (aussi appelé <strong><span style="color: #008000">VIH</span></strong>). Une personne peut attraper le virus du sida, on dit alors qu’elle est<strong> séropositive</strong>, sans être malade du sida. Pour cela, il ne faut pas que le <span style="color: #008000"><strong>virus</strong></span> se développe.</p>
<h3><span style="color: #800080"><b>Comment s’attrape le sida ? </b></span></h3>
<p>Le virus du sida se transmet par le sang : si le sang d’une personne infectée entre en contact avec le sang d’une autre personne (à travers une plaie ou une coupure par exemple). Mais aussi par voie sexuelle : si une personne porteuse du virus a une relation sexuelle avec une autre personne. En revanche, ce n’est pas en buvant dans le même verre, en nageant dans la même piscine ou en embrassant un séropositif que l’on attrape le sida.</p>
<h3><span style="color: #800080"><b>Pourquoi le dépistage est-il important ? </b></span></h3>
<p>En France, trente mille personnes vivraient avec le virus du sida sans le savoir, autant de personnes susceptibles de transmettre le virus. C’est pour cela que<strong> le dépistage est crucial dans la lutte contre la maladie</strong>. Plus la maladie est dépistée tôt, plus le malade peut être pris en charge et soigné. Surtout, une personne dépistée pourra prendre les précautions pour ne pas transmettre la maladie à d’autres. Elle pourra, par exemple, utiliser des <span style="color: #008000"><strong>préservatifs</strong></span> lors de rapports sexuels.</p>
<p>Pour encourager le dépistage, la ministre de la Santé, Marisol Touraine, propose de mettre en place des autotests : des tests que l’on peut faire chez soi en prélevant une goutte de sang ou de salive.</p>
<h3><span style="color: #800080"><b>Peut-on soigner cette maladie ? </b></span></h3>
<p>On peut soigner les malades du sida mais on ne peut pas les guérir. Grâce aux avancées médicales, les personnes séropositives peuvent aujourd’hui vivre avec le virus. Des traitements permettent de bloquer le virus : il est toujours présent dans le corps mais il ne se développe plus. Le problème, c’est que ces traitements sont difficiles à supporter. Chaque année, <strong><a href="http://1jour1actu.com/science/virus-sida-guerison-bebe/">des progrès sont faits dans la lutte contre le sida</a></strong>. L’objectif des médecins et des chercheurs est de <strong>trouver un vaccin contre le virus du sida</strong>, qui permette de stopper la progression du virus.</p>
<h2><strong></strong><b>Le dico du jour :</b></h2>
<p><span style="color: #333333"><span style="color: #008000"><strong>Sida </strong><span style="color: #333333">:</span></span> Ce mot signifie syndrome d’immunodéficience acquise. </span></p>
<p><span style="color: #0e0e0e"><span style="color: #008000"><strong>VIH</strong></span> : <span style="color: #333333">Virus d’immunodéficience humaine. C’est le nom scientifique du virus responsable du sida. </span></span></p>
<p><span style="color: #008000"><strong>Virus</strong></span> : C’est un petit agent infectieux qui se propage dans le corps en parasitant des cellules.</p>
<p><span style="color: #008000"><strong>Préservatif</strong></span> : enveloppe de caoutchouc qui se met sur le sexe de l&rsquo;homme au moment des rapports sexuels pour se protéger de certaines maladies comme le sida et pour éviter d&rsquo;avoir des enfants.</p>
<h2><b>D’où vient ce ruban rouge ? </b></h2>
<p>Le ruban rouge est le symbole international de la lutte contre le sida et de la solidarité envers les personnes atteintes de la maladie. Ce symbole trouve son origine aux États-Unis dans les années 1990. Les familles de soldats américains partis combattre pour la guerre du Golfe mettaient des rubans jaunes sur les portes de leur maison pour afficher leur espoir de voir leurs proches revenir.</p>
<h2><strong>Le quiz du jour :</strong></h2>
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  <h2>Sur le dépistage du sida</h2>
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            <div class='mtq_question mtq_scroll_item-7' id='mtq_question-1-7'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-7' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-7' class='mtq_question_text'>Comment s'appelle la manifestation pour la lutte contre le sida ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-7' onclick='mtq_button_click(1,1,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-7' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-7' class='mtq_answer_text'>Action Sida.</div></td></tr><tr id='mtq_row-1-2-7' onclick='mtq_button_click(1,2,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-7' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-7' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-7' class='mtq_answer_text'>Sidaction.</div></td></tr><tr id='mtq_row-1-3-7' onclick='mtq_button_click(1,3,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-7' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-7' class='mtq_answer_text'>Sidagir.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-7' id='mtq_question-2-7'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-7' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-7' class='mtq_question_text'>En 2012, quelle somme d'argent a été recueillie ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-7' onclick='mtq_button_click(2,1,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-7' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-7' class='mtq_answer_text'>4 000 000 000 d'euros.</div></td></tr><tr id='mtq_row-2-2-7' onclick='mtq_button_click(2,2,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-7' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-7' class='mtq_answer_text'>40 000 000 d'euros.</div></td></tr><tr id='mtq_row-2-3-7' onclick='mtq_button_click(2,3,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-7' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-7' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-7' class='mtq_answer_text'>4 000 000 d'euros.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-7' id='mtq_question-3-7'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-7' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-7' class='mtq_question_text'>Comment appelle-t-on une personne infectée par le virus du sida ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-7' onclick='mtq_button_click(3,1,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-1-7' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 3, Choice 1'>A</div><div id='mtq_marker-3-1-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-1-7' class='mtq_answer_text'>Une personne séronégative.</div></td></tr><tr id='mtq_row-3-2-7' onclick='mtq_button_click(3,2,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-2-7' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 3, Choice 2'>B</div><div id='mtq_marker-3-2-7' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-2-7' class='mtq_answer_text'>Une personne séropositive.</div></td></tr><tr id='mtq_row-3-3-7' onclick='mtq_button_click(3,3,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-3-7' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 3, Choice 3'>C</div><div id='mtq_marker-3-3-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-3-7' class='mtq_answer_text'>Une personne séroneutre.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-7' id='mtq_question-4-7'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 4</div><div id='mtq_stamp-4-7' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-4-7' class='mtq_question_text'>En France, combien de personnes vivraient avec le virus sans le savoir ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-4-1-7' onclick='mtq_button_click(4,1,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-1-7' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 4, Choice 1'>A</div><div id='mtq_marker-4-1-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-1-7' class='mtq_answer_text'>300 000.</div></td></tr><tr id='mtq_row-4-2-7' onclick='mtq_button_click(4,2,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-2-7' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 4, Choice 2'>B</div><div id='mtq_marker-4-2-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-2-7' class='mtq_answer_text'>3 000.</div></td></tr><tr id='mtq_row-4-3-7' onclick='mtq_button_click(4,3,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-3-7' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 4, Choice 3'>C</div><div id='mtq_marker-4-3-7' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-3-7' class='mtq_answer_text'>30 000.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-7' id='mtq_question-5-7'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 5</div><div id='mtq_stamp-5-7' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-5-7' class='mtq_question_text'>À quoi sert le dépistage du sida ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-5-1-7' onclick='mtq_button_click(5,1,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-1-7' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 5, Choice 1'>A</div><div id='mtq_marker-5-1-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-1-7' class='mtq_answer_text'>À guérir les personnes atteintes du sida.</div></td></tr><tr id='mtq_row-5-2-7' onclick='mtq_button_click(5,2,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-2-7' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 5, Choice 2'>B</div><div id='mtq_marker-5-2-7' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-2-7' class='mtq_answer_text'>À mieux soigner les personnes atteintes du sida.</div></td></tr><tr id='mtq_row-5-3-7' onclick='mtq_button_click(5,3,7)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-3-7' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 5, Choice 3'>C</div><div id='mtq_marker-5-3-7' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-3-7' class='mtq_answer_text'>À financer la recherche pour lutter contre le sida.</div></td></tr></table></div>            <div id="mtq_results_request-7" class="mtq_results_request mtq_scroll_item-7">
        Une fois terminé, cliquez sur le bouton ci-dessous. Tous les objets que vous n'avez pas complété seront marqués comme incorrect.        <span id="mtq_results_button-7" class='mtq_action_button mtq_css_button mtq_results_button'  onclick='mtq_get_results(7)'> <span class="mtq_results_text">
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  <!--mtq_status-->
    <div id="mtq_quiz_status-7" class="mtq_quiz_status">
  Il y a 5 questions à compléter.  </div>
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    Retour    </div> </div> <div id="mtq_shaded_item_msg-7" class="mtq_shaded_item_msg">
    Les questions en gris sont complétées.    </div>
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        <td id='mtq_list_item-1-7' class='mtq_list_item' onclick='mtq_nav_click(1,7)'>1</td><td id='mtq_list_item-2-7' class='mtq_list_item' onclick='mtq_nav_click(2,7)'>2</td><td id='mtq_list_item-3-7' class='mtq_list_item' onclick='mtq_nav_click(3,7)'>3</td><td id='mtq_list_item-4-7' class='mtq_list_item' onclick='mtq_nav_click(4,7)'>4</td><td id='mtq_list_item-5-7' class='mtq_list_item' onclick='mtq_nav_click(5,7)'>5</td></tr><tr><td id='mtq_list_item-end-7' class='mtq_list_item' onclick='mtq_nav_click(6,7)'>Fin</td>      </tr>
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    Retour    </div> </div></div>
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			<wfw:commentRss>http://1jour1actu.com/science/depistage-du-sida/feed/</wfw:commentRss>
		<slash:comments>23</slash:comments>
	<enclosure url='http://1jour1actu.com/wp-content/uploads/sida.jpg' length ='81601'  type='image/jpg' /> 
 <pubDate>Mon, 08 Apr 2013 12:38:21 +0000 UTC</pubDate>  
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		<title>Voici la photo de notre Univers quand il était bébé !</title>
		<link>http://1jour1actu.com/science/univers-creation/</link>
		<comments>http://1jour1actu.com/science/univers-creation/#comments</comments>
		<pubDate>Mon, 01 Apr 2013 08:00:04 +0000</pubDate>
		<dc:creator>Muriel Valin</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=131765</guid>
		<description><![CDATA[1 avril 2013<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/univer-ok-300x164.jpg" class="attachment-medium wp-post-image" alt="Voici l&#039;image de l&#039;univers reconstitué à partir des données du super satellite &quot;Planck&quot;. (© ESA and the Planck Collaboration)" /></p><p><strong>De loin, cette image te fait peut-être penser à un tableau de peinture. Eh bien, non, il s’agit de la toute première photo représentant notre Univers, lorsqu’il était à peine formé. Autrement dit, voici notre Univers bébé. Une vraie prouesse qui devrait nous apprendre plein, plein d’informations en astronomie.</strong></p>
 <a href="http://1jour1actu.com/science/univers-creation/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	1 avril 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/univer-ok-300x164.jpg" class="attachment-medium wp-post-image" alt="Voici l&#039;image de l&#039;univers reconstitué à partir des données du super satellite &quot;Planck&quot;. (© ESA and the Planck Collaboration)" /></p><h2><b>Pourquoi en parle-t-on ?</b></h2>
<p>Parce que cette photo vient d’être dévoilée par l’Agence spatiale européenne (ESA) et elle était très attendue par les astronomes.</p>
<h2><b>L’@ctu du jour :</b></h2>
<p>Regarde bien, ces petits points multicolores. C’est le premier portrait de notre Univers, quand il était bébé et qu’il avait… 380 000 ans ! Les taches que tu vois sur la photo sont par exemple des morceaux de matière qui sont des embryons de galaxies. Et les différentes couleurs te montrent leurs différentes températures. Voici donc en quelque sorte la photo d’un ancêtre très, très vieux de la Terre.</p>
<h3><span style="color: #800080"><b>Pourquoi dit-on qu’il était bébé alors qu’il avait 380 000 ans ?</b></span></h3>
<p>Eh bien, parce qu’à l’échelle de l’astronomie, c’est excessivement jeune. Imagine un peu, l’Univers a commencé à se développer il y a 13,8 milliards d’années, après le Big Bang. La Terre, quant à elle, a vu le jour il y a 4,6 milliards d’années. Quand l’Univers avait 380 000 ans, il était donc bel et bien un bébé.</p>
<h3><span style="color: #800080"><b>Comment cette photo a été prise ?</b></span></h3>
<p>Ce cliché n’a pas pu être pris avec un appareil photo banal car il n’aurait pas été assez puissant. Par ailleurs, depuis la Terre, l’atmosphère aurait formé un obstacle qui aurait empêché de voir l’espace. C’est un satellite, qui s’appelle « Planck » (en hommage à un physicien allemand célèbre, Max Planck), qui a été envoyé dans l’espace en 2009 et qui a pris l’image. Ce satellite était équipé d’instruments scientifiques très sophistiqués (télescopes, capteurs…). Pendant 4 ans, ils ont pris des mesures et, mises bout à bout, ces informations ont permis de construire ce cliché.</p>
<h3><b><span style="color: #800080">Mais comment a-t-on pu prendre une photo dans le passé ? </span> </b></h3>
<p>En fait, les instruments du satellite ont réussi à capter de la lumière qui a été émise par de la matière située très, très loin dans l’espace et qui a envoyé cette lumière, il y a plus de 13 milliards d’années. Entre-temps, la lumière a voyagé dans l’Univers à la vitesse de 300 000 km/s, elle a parcouru des millions et des millions de kilomètres et elle est finalement parvenue à atteindre le satellite entre 2009 et 2013. L’image obtenue par Planck est donc bel et bien celle qui correspond à l’Univers tel qu’il était quand il était bébé.</p>
<h3><b><span style="color: #800080">Qu’est-ce que cette photo va nous apprendre ?</span> </b></h3>
<p>Cette image va nous permettre d’étudier et de retracer l’enfance de l’Univers qui est encore très mal connue des scientifiques. Les astronomes espèrent ainsi découvrir comment l’Univers a grossi, comment il a évolué… Comment il a donné naissance à des galaxies, aux étoiles et aux planètes, et notamment à la Terre.</p>
<h2><strong>Le quiz du jour :</strong></h2>
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  <h2>Sur la création de l'Univers</h2>
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            <div class='mtq_question mtq_scroll_item-8' id='mtq_question-1-8'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-8' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-8' class='mtq_question_text'>Qui a dévoilé la photo ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-8' onclick='mtq_button_click(1,1,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-8' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-8' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-8' class='mtq_answer_text'>L'ESA.</div></td></tr><tr id='mtq_row-1-2-8' onclick='mtq_button_click(1,2,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-8' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-8' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-8' class='mtq_answer_text'>Le FBI.</div></td></tr><tr id='mtq_row-1-3-8' onclick='mtq_button_click(1,3,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-8' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-8' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-8' class='mtq_answer_text'>La NASA.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-8' id='mtq_question-2-8'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-8' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-8' class='mtq_question_text'>Quand l'Univers a-t-il commencé à se développer ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-8' onclick='mtq_button_click(2,1,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-8' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-8' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-8' class='mtq_answer_text'>Il y a 1 380 000 000 d'années.</div></td></tr><tr id='mtq_row-2-2-8' onclick='mtq_button_click(2,2,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-8' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-8' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-8' class='mtq_answer_text'>Il y a 13 800 000 000 d'années.</div></td></tr><tr id='mtq_row-2-3-8' onclick='mtq_button_click(2,3,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-8' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-8' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-8' class='mtq_answer_text'>Il y a 138 000 000 d'années.</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-8' id='mtq_question-3-8'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-8' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-8' class='mtq_question_text'>Comment s'appelle le satellite qui a pris la photo ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-8' onclick='mtq_button_click(3,1,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-1-8' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 3, Choice 1'>A</div><div id='mtq_marker-3-1-8' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-1-8' class='mtq_answer_text'>Plock.</div></td></tr><tr id='mtq_row-3-2-8' onclick='mtq_button_click(3,2,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-2-8' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 3, Choice 2'>B</div><div id='mtq_marker-3-2-8' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-2-8' class='mtq_answer_text'>Planck.</div></td></tr><tr id='mtq_row-3-3-8' onclick='mtq_button_click(3,3,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-3-8' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 3, Choice 3'>C</div><div id='mtq_marker-3-3-8' class='mtq_marker 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class='mtq_question_label '>Question 5</div><div id='mtq_stamp-5-8' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-5-8' class='mtq_question_text'>Quel est l'âge de la Terre ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-5-1-8' onclick='mtq_button_click(5,1,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-1-8' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 5, Choice 1'>A</div><div id='mtq_marker-5-1-8' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-1-8' class='mtq_answer_text'>6,4 milliards d'années.</div></td></tr><tr id='mtq_row-5-2-8' onclick='mtq_button_click(5,2,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-2-8' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 5, Choice 2'>B</div><div id='mtq_marker-5-2-8' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-2-8' class='mtq_answer_text'>4,6 milliards d'années.</div></td></tr><tr id='mtq_row-5-3-8' onclick='mtq_button_click(5,3,8)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-3-8' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 5, Choice 3'>C</div><div id='mtq_marker-5-3-8' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-3-8' class='mtq_answer_text'>46 milliards d'années.</div></td></tr></table></div>            <div id="mtq_results_request-8" class="mtq_results_request mtq_scroll_item-8">
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			<wfw:commentRss>http://1jour1actu.com/science/univers-creation/feed/</wfw:commentRss>
		<slash:comments>38</slash:comments>
	<enclosure url='http://1jour1actu.com/wp-content/uploads/univer-ok.jpg' length ='379260'  type='image/jpg' /> 
 <pubDate>Mon, 01 Apr 2013 10:00:04 +0000 UTC</pubDate>  
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		<title>Mars : mission accomplie pour le robot Curiosity !</title>
		<link>http://1jour1actu.com/science/curiosity-mars/</link>
		<comments>http://1jour1actu.com/science/curiosity-mars/#comments</comments>
		<pubDate>Wed, 20 Mar 2013 10:07:25 +0000</pubDate>
		<dc:creator>Catherine MENGUY</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=130127</guid>
		<description><![CDATA[20 mars 2013<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/curiosity-une-300x164.jpg" class="attachment-medium wp-post-image" alt="curiosity robot" /></p><p><strong>Mars est la planète du système solaire qui ressemble le plus à la Terre : elle possède des volcans et, il y a trois milliards d’années, elle a abrité de l’eau liquide. Depuis sept mois, le robot Curiosity fouille le sol de Mars pour trouver d’autres traces de ressemblances entre les deux planètes. Mission accomplie : Curiosity vient d’apporter la preuve que des organismes vivants ont pu exister sur Mars. Olivier Sanguy, de la Cité de l’espace, à Toulouse, nous éclaire sur cette grande découverte spatiale.</strong></p>
 <a href="http://1jour1actu.com/science/curiosity-mars/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	20 mars 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="164" src="http://1jour1actu.com/wp-content/uploads/curiosity-une-300x164.jpg" class="attachment-medium wp-post-image" alt="curiosity robot" /></p><h2><strong>Pourquoi parle-t-on de Curiosity et de Mars ?</strong></h2>
<p>Parce que le <strong>robot Curiosity</strong> envoyé sur Mars permet aujourd’hui d’affirmer que cette planète aurait pu accueillir la vie.</p>
<h2><strong>L&rsquo;@ctu du jour :</strong></h2>
<h3><span style="color: #800080"><strong>L’outil </strong></span></h3>
<p><a title="curiosity" href="http://1jour1actu.com/science/robot-curiosity-deja-100-jours-sur-mars/" target="_blank"><strong>Curiosity</strong> </a>n’a rien à voir avec l’un de tes engins télécommandés. Il pèse neuf cents kilos et il a la taille d’une voiture de ville. Il a embarqué à son bord une foreuse puissante permettant de percer la roche. Il possède aussi deux laboratoires pour analyser les roches récoltées.</p>
<p>Il est arrivé sur Mars le 6 août dernier. Sa mission se terminera dans deux ans. <i>« C’est un robot extraordinaire »</i>, souligne, enthousiaste, Olivier Sanguy.</p>
<h3><span style="color: #800080"><strong>La mission</strong></span></h3>
<p>La roche actuelle de <strong>Mars</strong> est très oxydée (un peu comme si elle était rouillée) en raison du climat très agressif qui règne sur cette planète. Il fallait donc percer en profondeur pour retrouver des traces de ce qu’était Mars il y a trois milliards d’années, du temps où son climat était tempéré. Pour cela, Curiosity a recueilli un peu de poussière dans le lit d’une ancienne rivière. La poussière a été chauffée, puis analysée par les laboratoires embarqués dans le robot.</p>
<h3><span style="color: #800080"><strong>La découverte</strong></span></h3>
<p>L’eau est l’élément indispensable à l’apparition de la vie. Or, dans la poussière recueillie, les chercheurs ont trouvé la présence d’argile, une terre qui contient de grandes quantités d’eau. En plus, cette eau n’était pas trop acide. On aurait presque pu la boire.</p>
<p>Elle était donc tout à fait propice à la vie. <i>« Attention !,</i> précise Olivier Sanguy. <i>Cette découverte ne permet pas de dire qu’il y a eu une vie sur Mars, mais que tout était en place pour que la vie apparaisse. C’est un peu comme si vous rentriez dans une pièce et que vous trouviez un lit, du pain, un radiateur. Rien ne dit que quelqu’un habite là. En revanche, tout est en place pour qu’une personne y vive. »</i></p>
<h3><span style="color: #800080"><strong>Et après ?</strong></span></h3>
<p><strong>Mars</strong> est la seule planète avec la Terre dont on a maintenant la preuve qu’elle aurait pu abriter la vie. Le robot Curiosity a rempli sa mission principale. Mais il va continuer son exploration en effectuant un second forage à proximité du premier. Toutes ses découvertes permettront de mieux comprendre comment la vie apparaît… et disparaît d’un astre céleste.</p>
<h3><span style="color: #800080"><b>Pour info</b></span></h3>
<p>Si tu as l’occasion de visiter la Cité de l’espace, à Toulouse, tu y verras une maquette en taille réelle et animée de Curiosity.</p>
<h2><b>Le dico du jour :<br />
</b></h2>
<p><strong>Mars</strong> est la quatrième planète du système solaire en partant du Soleil. Elle se situe à 230 millions de kilomètres du Soleil. Elle tient son nom du dieu de la guerre romain Mars à cause de sa couleur rouge qui fait penser au sang des champs de bataille. Mars mesure 6 794 kilomètres de diamètre et pèse 6,42 billions de tonnes.</p>
<h2><strong>Le quiz du jour :</strong></h2>
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  <h2>Sur le robot Curiosity</h2>
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            <div class='mtq_question mtq_scroll_item-9' id='mtq_question-1-9'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-9' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-9' class='mtq_question_text'>Il y a trois milliards d'années, que pouvait-on trouver sur Mars ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-9' onclick='mtq_button_click(1,1,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-9' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-9' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-9' class='mtq_answer_text'>Du pétrole</div></td></tr><tr id='mtq_row-1-2-9' onclick='mtq_button_click(1,2,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-9' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-9' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-9' class='mtq_answer_text'>Du gaz</div></td></tr><tr id='mtq_row-1-3-9' onclick='mtq_button_click(1,3,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-9' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-9' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-9' class='mtq_answer_text'>De l'eau</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-9' id='mtq_question-2-9'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-9' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-9' class='mtq_question_text'>Que vient-on de découvrir sur Mars ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-9' onclick='mtq_button_click(2,1,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-9' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-9' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-9' class='mtq_answer_text'>Des traces d'animaux</div></td></tr><tr id='mtq_row-2-2-9' onclick='mtq_button_click(2,2,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-9' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-9' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-9' class='mtq_answer_text'>Une vie possible</div></td></tr><tr id='mtq_row-2-3-9' onclick='mtq_button_click(2,3,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-9' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-9' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-9' class='mtq_answer_text'>Pas de traces de vie</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-9' id='mtq_question-3-9'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-9' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-9' class='mtq_question_text'>Où travaille le scientifique qui est interviewé ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-9' onclick='mtq_button_click(3,1,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-1-9' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 3, Choice 1'>A</div><div id='mtq_marker-3-1-9' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-1-9' class='mtq_answer_text'>À la Cité des sciences</div></td></tr><tr id='mtq_row-3-2-9' onclick='mtq_button_click(3,2,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-2-9' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 3, Choice 2'>B</div><div id='mtq_marker-3-2-9' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-2-9' class='mtq_answer_text'>À la Cité de l'astronomie</div></td></tr><tr id='mtq_row-3-3-9' onclick='mtq_button_click(3,3,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-3-3-9' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 3, Choice 3'>C</div><div id='mtq_marker-3-3-9' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-3-3-9' class='mtq_answer_text'>À la Cité de l'espace</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-9' id='mtq_question-4-9'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 4</div><div id='mtq_stamp-4-9' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-4-9' class='mtq_question_text'>Quelle est la distance entre Mars et le Soleil ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-4-1-9' onclick='mtq_button_click(4,1,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-1-9' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 4, Choice 1'>A</div><div id='mtq_marker-4-1-9' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-1-9' class='mtq_answer_text'>230 000 de kilomètres</div></td></tr><tr id='mtq_row-4-2-9' onclick='mtq_button_click(4,2,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-2-9' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 4, Choice 2'>B</div><div id='mtq_marker-4-2-9' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-2-9' class='mtq_answer_text'>230 000 000 de kilomètres</div></td></tr><tr id='mtq_row-4-3-9' onclick='mtq_button_click(4,3,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-4-3-9' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 4, Choice 3'>C</div><div id='mtq_marker-4-3-9' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-4-3-9' class='mtq_answer_text'>2 300 de kilomètres</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-9' id='mtq_question-5-9'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 5</div><div id='mtq_stamp-5-9' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-5-9' class='mtq_question_text'>Quel outil notre robot a-t-il utilisé pour percer la roche ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-5-1-9' onclick='mtq_button_click(5,1,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-1-9' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 5, Choice 1'>A</div><div id='mtq_marker-5-1-9' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-5-1-9' class='mtq_answer_text'>Une perceuse</div></td></tr><tr id='mtq_row-5-2-9' onclick='mtq_button_click(5,2,9)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-5-2-9' class='mtq_css_letter_button 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			<wfw:commentRss>http://1jour1actu.com/science/curiosity-mars/feed/</wfw:commentRss>
		<slash:comments>47</slash:comments>
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 <pubDate>Wed, 20 Mar 2013 12:07:25 +0000 UTC</pubDate>  
	</item>
		<item>
		<title>Alma : le télescope le plus puissant du monde</title>
		<link>http://1jour1actu.com/science/alma-telescope/</link>
		<comments>http://1jour1actu.com/science/alma-telescope/#comments</comments>
		<pubDate>Sun, 17 Mar 2013 08:10:33 +0000</pubDate>
		<dc:creator>Muriel Valin</dc:creator>
				<category><![CDATA[Science]]></category>

		<guid isPermaLink="false">http://1jour1actu.com/?p=129956</guid>
		<description><![CDATA[17 mars 2013<p></p><p><img width="300" height="188" src="http://1jour1actu.com/wp-content/uploads/telescope-une-chili-300x188.png" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir le radiotélescope Alma la nuit sous un grand ciel étoilé. © ESO/C. Malin" /></p><p><strong>Nous sommes en Amérique du Sud, en plein désert. À plus de 5 000 mètres d’altitude, un objet astronomique incroyable vient d’être dévoilé. Il s’appelle Alma et il s’agit du plus grand radiotélescope au monde. Tu es prêt pour le découvrir ?</strong></p>
 <a href="http://1jour1actu.com/science/alma-telescope/">Lire la suite&#160;<span class="meta-nav">&#8594;</span></a>]]></description>
	17 mars 2013			<content:encoded><![CDATA[<p></p><p><img width="300" height="188" src="http://1jour1actu.com/wp-content/uploads/telescope-une-chili-300x188.png" class="attachment-medium wp-post-image" alt="Sur cette photo, tu peux voir le radiotélescope Alma la nuit sous un grand ciel étoilé. © ESO/C. Malin" /></p><h2><b>Pourquoi parle-t-on du télescope Alma ?</b></h2>
<p>Parce que mercredi, l’un des projets astronomiques les plus gros du monde a été inauguré en grande pompe au Chili : il s’agit d’un télescope hors du commun.</p>
<h2><b>L’actu du jour :</b></h2>
<p>Voici un objet unique sur notre planète. Il contient 66 antennes, c’est-à-dire 66 gros télescopes tournés vers le ciel pour faire des observations dans l’espace. Son secret ? Grâce à un ordinateur ultra puissant, il est capable de mettre toutes les mesures de ces 66 télescopes en commun pour former un télescope géant de 16 kilomètres de diamètre !</p>
<h3><span style="color: #993366"><b>Pourquoi a-t-il été installé dans le désert ?</b></span></h3>
<p>Le désert du Chili est un lieu très pratique pour les observations astronomiques car il est loin de toute habitation. Du coup, il est épargné par les éclairages qui forment une pollution lumineuse. Il est aussi très sec ce qui permet de ne pas endommager ses appareils de mesure, avec la pluie ou la neige. Enfin, il est situé très haut (à 5 000 mètres d’altitude) ce qui signifie qu’il n’y a pas de montagnes à l’horizon qui risqueraient de boucher sa vue.</p>
<h3><span style="color: #993366"><b>À quoi ce télescope géant va-t-il servir ?</b></span></h3>
<p>Les 66 antennes vont être capables de faire des mesures très difficiles dans l’espace. Elles vont détecter des signaux invisibles émis par des étoiles extrêmement lointaines. On appelle cela des ondes radio. D’où le nom de radiotélescope. Ces signaux sont invisibles à l’œil nu et même impossibles à déceler avec des instruments astronomiques traditionnels (comme la lunette ou le petit télescope) parce qu’ils sont noyés dans des nuages de gaz qui les cachent.</p>
<p>Mais, avec ce radiotélescope, c’est comme si on avait une machine astronomique avec un œil extrêmement bien affûté. Il pourra alors étudier ces ondes qui vont nous renseigner sur la composition de certaines étoiles et galaxies très lointaines.</p>
<h3><span style="color: #993366"><b>Que va-t-on apprendre grâce à ces résultats ?</b></span></h3>
<p>Grâce à Alma, on va remonter dans le temps, jusqu’au début de l’Univers. Véridique ! En fait, en astronomie, quand on étudie des étoiles très lointaines, c’est comme si on remontait dans le passé. La raison est simple : la lumière qui est émise par des étoiles lointaines doit mettre des années pour traverser l’espace et parvenir jusqu’à nous puisqu’elle voyage à la vitesse de la lumière (300 000 km/s).</p>
<p>Quand on regarde une de ces étoiles, on voit donc comment elle était il y a très longtemps. Grâce à Alma, on peut donc espérer apprendre plein de choses sur l’Univers et sa formation, il y a plusieurs milliards d’années. Fascinant, non ?</p>
<h2><strong>Le quiz du jour :</strong></h2>
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  <h2>Sur le télescope Alma</h2>
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            <div class='mtq_question mtq_scroll_item-10' id='mtq_question-1-10'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 1</div><div id='mtq_stamp-1-10' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-1-10' class='mtq_question_text'>Combien d'antennes contient Alma ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-1-1-10' onclick='mtq_button_click(1,1,10)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-1-10' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 1, Choice 1'>A</div><div id='mtq_marker-1-1-10' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-1-10' class='mtq_answer_text'>66 antennes</div></td></tr><tr id='mtq_row-1-2-10' onclick='mtq_button_click(1,2,10)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-2-10' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 1, Choice 2'>B</div><div id='mtq_marker-1-2-10' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-2-10' class='mtq_answer_text'>86 antennes</div></td></tr><tr id='mtq_row-1-3-10' onclick='mtq_button_click(1,3,10)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-1-3-10' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 1, Choice 3'>C</div><div id='mtq_marker-1-3-10' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-1-3-10' class='mtq_answer_text'>76 antennes</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-10' id='mtq_question-2-10'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 2</div><div id='mtq_stamp-2-10' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-2-10' class='mtq_question_text'>Que va permettre Alma ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-2-1-10' onclick='mtq_button_click(2,1,10)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-1-10' class='mtq_css_letter_button mtq_letter_button_0'  alt='Question 2, Choice 1'>A</div><div id='mtq_marker-2-1-10' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-1-10' class='mtq_answer_text'>Voyager dans le futur</div></td></tr><tr id='mtq_row-2-2-10' onclick='mtq_button_click(2,2,10)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-2-10' class='mtq_css_letter_button mtq_letter_button_1'  alt='Question 2, Choice 2'>B</div><div id='mtq_marker-2-2-10' class='mtq_marker mtq_correct_marker' alt='Correct'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-2-10' class='mtq_answer_text'>Remonter dans le temps</div></td></tr><tr id='mtq_row-2-3-10' onclick='mtq_button_click(2,3,10)' class='mtq_clickable'><td class='mtq_letter_button_td'><div id='mtq_button-2-3-10' class='mtq_css_letter_button mtq_letter_button_2'  alt='Question 2, Choice 3'>C</div><div id='mtq_marker-2-3-10' class='mtq_marker mtq_wrong_marker' alt='Faux'></div></td><td class='mtq_answer_td'><div id='mtq_answer_text-2-3-10' class='mtq_answer_text'>Découvrir la sixième dimension</div></td></tr></table></div><div class='mtq_question mtq_scroll_item-10' id='mtq_question-3-10'><table class='mtq_question_heading_table'><tr><td><div class='mtq_question_label '>Question 3</div><div id='mtq_stamp-3-10' class='mtq_stamp'></div></td></tr></table><div id='mtq_question_text-3-10' class='mtq_question_text'>Où se situe Alma ?</div><table class='mtq_answer_table'><colgroup><col class='mtq_oce_first'/></colgroup><tr id='mtq_row-3-1-10' onclick='mtq_button_click(3,1,10)' class='mtq_clickable'><td class='mtq_letter_button_td'><div 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		<slash:comments>25</slash:comments>
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 <pubDate>Sun, 17 Mar 2013 10:10:33 +0000 UTC</pubDate>  
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