{"id":9701,"date":"2014-11-16T00:50:47","date_gmt":"2014-11-16T00:50:47","guid":{"rendered":"https:\/\/harissa.com\/news-wp\/?p=9701"},"modified":"2014-11-16T17:27:55","modified_gmt":"2014-11-16T17:27:55","slug":"sonde-rosetta-un-israelien-au-coeur-du-projetcomme-par-hasard","status":"publish","type":"post","link":"https:\/\/harissa.com\/news-wp\/sonde-rosetta-un-israelien-au-coeur-du-projetcomme-par-hasard\/","title":{"rendered":"Sonde Rosetta : un isra\u00e9lien au coeur du projet&#8230;comme par hasard&#8230;"},"content":{"rendered":"<p>\n\tSonde Rosetta : un isra&eacute;lien au coeur du projet&#8230;comme par hasard&#8230;<\/p>\n<div>\n<p>\n\t\t&nbsp;<\/p>\n<\/div>\n<div id=\"post-body-3099366474525661068\" itemprop=\"description articleBody\">\n<p>\n\t\t&nbsp;<\/p>\n<p>\n\t\t&nbsp;<\/p>\n<p>\n\t\tLe professeur Akiva Bar-Nun du D&eacute;partement des sciences de la Terre de l&rsquo;Universit&eacute; de Tel-Aviv a particip&eacute; depuis 25 ans au projet phare de l&rsquo;Agence spatiale europ&eacute;enne Rosetta, dans le cadre duquel Philae, petit atterrisseur (lander en anglais) de 100 kilogrammes, se pose mercredi 12 novembre &agrave; la surface de la com&egrave;te Churyumov Gerasimenko. C&rsquo;est la premi&egrave;re fois dans l&rsquo;histoire qu&rsquo;une sonde spatiale se posera sur une com&egrave;te&#8230;<br \/>\n\t\t&nbsp;<\/p>\n<p>\n\t\t<br \/>\n\t\tLe 12 novembre &agrave; 9h35 du matin heure fran&ccedil;aise, Philae se d&eacute;tachera de la sonde spatiale Rosetta, lanc&eacute;e pour la premi&egrave;re fois en 2004, et mise en orbite depuis le 6 ao&ucirc;t 2014 autour de la com&egrave;te, d&eacute;couverte en 1969 par un astronome russe. Apr&egrave;s s&rsquo;&ecirc;tre d&eacute;tach&eacute; de la sonde, le lander d&eacute;passera une altitude de 22 km et atterrira sur le corps c&eacute;leste &agrave; 16h30.&nbsp;<br \/>\n\t\tLes nouvelles du lointain vaisseau spatial ne parviendront &agrave; la Terre qu&rsquo;apr&egrave;s 28 minutes, de sorte que ce n&rsquo;est qu&rsquo;&agrave; 17h00 heure fran&ccedil;aise qu&rsquo;on saura si Philae a pu accoster. L&rsquo;atterrisseur devra s&rsquo;ancrer solidement au sol de glace de la com&egrave;te &agrave; l&rsquo;aide de harpons, mesure n&eacute;cessaire en raison de la tr&egrave;s faible gravit&eacute; &agrave; la surface du corps cosmique.<br \/>\n\t\t&ldquo;Jusqu&rsquo;&agrave; pr&eacute;sent, tous les vaisseaux spatiaux sont pass&eacute;s &agrave; proximit&eacute; des com&egrave;tes, mais aucun ne s&rsquo;est jamais ancr&eacute; dessus&rdquo; explique le Prof. Bar-Nun. Il y a 25 ans un groupe de chercheurs, parmi lesquels le professeur du D&eacute;partement des sciences de la Terre de l&rsquo;Universit&eacute; de Tel-Aviv, ont con&ccedil;u l&rsquo;id&eacute;e de lancer une mission spatiale d&eacute;di&eacute;e aux com&egrave;tes, corps c&eacute;lestes constitu&eacute;s d&rsquo;un noyau de glace et de poussi&egrave;re en orbite autour d&rsquo;une &eacute;toile, vestiges du processus de formation du syst&egrave;me solaire.&nbsp;<br \/>\n\t\tL&rsquo;objectif principal de Rosetta est de recueillir des donn&eacute;es sur la composition du noyau de la com&egrave;te et sur son comportement &agrave; l&rsquo;approche du soleil.<br \/>\n\t\t&nbsp;Le petit atterrisseur Philae doit se poser sur sa surface pour analyser in situ la composition du sol. &ldquo;Il y a 25 ans que nous voulions atterrir sur la com&egrave;te, effectuer un forage et rapporter le mat&eacute;riel sur la Terre&rdquo; explique le chercheur. &ldquo;Le probl&egrave;me &eacute;tait que nous ne connaissions pas la r&eacute;sistance m&eacute;canique du sol. Il faut savoir qu&rsquo;une com&egrave;te a tr&egrave;s peu de force d&rsquo;attraction, il faut donc s&rsquo;arrimer &agrave; sa surface de force. Mais il s&rsquo;av&egrave;re que la glace de la surface n&rsquo;est pas particuli&egrave;rement dense ; elle est plut&ocirc;t comme de la neige qui vient de tomber et est rest&eacute;e tr&egrave;s tendre&rdquo;.<br \/>\n\t\tJusqu&rsquo;&agrave; pr&eacute;sent les chercheurs ont re&ccedil;u des donn&eacute;es indiquant que la com&egrave;te s&rsquo;est form&eacute;e &agrave; une temp&eacute;rature de moins 250&deg; Celsius &agrave; l&rsquo;extr&eacute;mit&eacute; du syst&egrave;me solaire. Une autre constatation r&eacute;duit l&rsquo;importance des com&egrave;tes dans l&rsquo;apport de l&rsquo;eau et des mati&egrave;res organiques sur la Terre &agrave; ses d&eacute;buts, contrairement aux th&eacute;ories pr&eacute;c&eacute;dentes.<br \/>\n\t\t&nbsp;&ldquo;La donn&eacute;e la plus importante pour le moment est la pr&eacute;sence d&rsquo;azote&rdquo; explique le Prof. Bar-Nun. &ldquo;Jusqu&rsquo;&agrave; pr&eacute;sent, on n&rsquo;avait pas trouv&eacute; d&rsquo;azote sur les com&egrave;tes. Maintenant nous pensons y trouver &eacute;galement des gaz rares comme l&rsquo;argon, le krypton et le n&eacute;on. Plus la com&egrave;te, et la sonde Rosetta avec elle, se rapproche du soleil, plus elle se r&eacute;chauffe et devient de plus en plus active, ce qui nous permet d&rsquo;y d&eacute;couvrir des mat&eacute;riaux pr&eacute;sents &agrave; sa surface &agrave; des concentrations tr&egrave;s faibles&rdquo;.<br \/>\n\t\tLe nom choisi pour la mission fait r&eacute;f&eacute;rence &agrave; la pierre de Rosette qui permit &agrave; Jean-Fran&ccedil;ois Champollion de d&eacute;chiffrer les hi&eacute;roglyphes en 1822. L&rsquo;atterrisseur a &eacute;t&eacute; baptis&eacute; en r&eacute;f&eacute;rence &agrave; l&rsquo;ob&eacute;lisque Phil&aelig; qui fournit les cl&eacute;s permettant de compl&eacute;ter le d&eacute;chiffrage de Champollion. Apr&egrave;s la fin pr&eacute;vue de leur mission en d&eacute;cembre 2015, Rosetta et Philae accompagneront la com&egrave;te jusqu&rsquo;&agrave; sa d&eacute;sint&eacute;gration ou sa collision avec un autre corps c&eacute;leste, &agrave; une date tr&egrave;s &eacute;loign&eacute;e dans le futur. C&rsquo;est pourquoi un disque en nickel a-t-il &eacute;t&eacute; fix&eacute; &agrave; l&rsquo;ext&eacute;rieur de l&rsquo;orbiteur, sur lequel sont micro-grav&eacute;s des textes dans un millier de langues, dans le but de pr&eacute;server la connaissance de celles-ci en cr&eacute;ant des &ldquo;pierres de Rosette&rdquo; destin&eacute;es &agrave; nos lointains descendants.<br \/>\n\t\tSource&nbsp;<a href=\"http:\/\/siliconwadi.fr\/15786\/dans-2-jours-une-sonde-spatiale-se-posera-sur-une-comete\">SiliconWadi<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Sonde Rosetta : un isra&eacute;lien au coeur du projet&#8230;comme par hasard&#8230; &nbsp; &nbsp; &nbsp; Le professeur Akiva Bar-Nun du D&eacute;partement des sciences de la Terre de l&rsquo;Universit&eacute; de Tel-Aviv a particip&eacute; depuis 25 ans au projet phare de l&rsquo;Agence spatiale europ&eacute;enne Rosetta, dans le cadre duquel Philae, petit atterrisseur (lander en anglais) de 100 kilogrammes,&hellip;&nbsp;<\/p>\n","protected":false},"author":2,"featured_media":19332,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[12,35,1],"tags":[],"class_list":["post-9701","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-israel","category-tel-aviv","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sonde Rosetta : un isra\u00e9lien au coeur du projet...comme par hasard... | HARISSA.COM<\/title>\n<meta name=\"description\" content=\"Le professeur Akiva 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