{"id":1441,"date":"2014-12-25T09:01:29","date_gmt":"2014-12-25T09:01:29","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1441"},"modified":"2015-01-03T08:54:33","modified_gmt":"2015-01-03T08:54:33","slug":"mars-le-mystere-du-methane-reste-entier","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/25\/mars-le-mystere-du-methane-reste-entier\/","title":{"rendered":"Mars : le myst\u00e8re du m\u00e9thane reste entier"},"content":{"rendered":"<p>L&#8217;histoire du m\u00e9thane martien a commenc\u00e9 en 2003, quand l&#8217;orbiteur europ\u00e9en Mars Express en a d\u00e9tect\u00e9 pour la premi\u00e8re fois dans l&#8217;atmosph\u00e8re de la <a title=\"Mars et le Sagittaire\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/10\/31\/mars-sagittaire\/\" target=\"_blank\">Plan\u00e8te rouge<\/a>.<\/p>\n<p>Pour expliquer la pr\u00e9sence de ce compos\u00e9 chimique, les chimistes propos\u00e8rent alors diff\u00e9rente sc\u00e9narios, comme l&#8217;action des rayons ultraviolets sur de la\u00a0mati\u00e8re organique amen\u00e9e par des <a title=\"Les grosses m\u00e9t\u00e9orites inqui\u00e8tent les scientifiques\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/24\/les-grosses-meteorites-inquietent-les-scientifiques\/\" target=\"_blank\">m\u00e9t\u00e9orites<\/a>,\u00a0ou la d\u00e9gradation de microbes dans le sous-sol martien.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/mars.jpg\" rel=\"lightbox[1441]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1443\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/mars-450x305.jpg\" alt=\"mars\" width=\"450\" height=\"305\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/mars-450x305.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/mars.jpg 1024w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>On attendait donc beaucoup des mesures du taux de m\u00e9thane directement r\u00e9alis\u00e9es au niveau du sol martien.<\/p>\n<p><!--more-->Utilisant son spectrom\u00e8tre<a title=\"TLS\" href=\"http:\/\/www.nasa.gov\/mission_pages\/msl\/multimedia\/webster1.html\" target=\"_blank\"> TLS<\/a> (<em>Tunable Laser Spectrometer<\/em>), le rover <a title=\"Le crat\u00e8re Gale, sur Mars, est un ancien lac\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/15\/le-cratere-gale-sur-mars-est-un-ancien-lac\/\" target=\"_blank\">Curiosity <\/a>a r\u00e9alis\u00e9 un peu plus d&#8217;une dizaine de mesures depuis son arriv\u00e9e sur la Plan\u00e8te rouge au cours de l&#8217;\u00e9t\u00e9 2012. Ces mesures, qui viennent d&#8217;\u00eatre pr\u00e9sent\u00e9es, ont de quoi troubler les chimistes :<\/p>\n<ul>\n<li>d&#8217;une part le taux moyen de m\u00e9thane mesur\u00e9 par Curiosity est bien plus faible que celui qu&#8217;on observe en laboratoire quand on soumet de la mati\u00e8re organique \u00e0 l&#8217;action des UV, comme s&#8217;il existait sur Mars un processus inconnu de destruction du m\u00e9thane<\/li>\n<li>d&#8217;autre part les taux de m\u00e9thane martiens peuvent varier d&#8217;un facteur 10, sugg\u00e9rant de brusques d\u00e9gazages que les scientifiques ne s&#8217;expliquent pas<\/li>\n<\/ul>\n<p>On esp\u00e8re y voir plus clair avec les donn\u00e9es que fournira <em><a title=\"Trace Gas Orbiter\" href=\"http:\/\/exploration.esa.int\/mars\/46475-trace-gas-orbiter\/\" target=\"_blank\">Trace Gas Orbiter<\/a>,\u00a0<\/em>l&#8217;orbiteur de la mission europ\u00e9enne <a title=\"Mission ExoMars\" href=\"http:\/\/smsc.cnes.fr\/EXOMARS\/Fr\/\" target=\"_blank\">ExoMars <\/a>qui sera mis en orbite autour de la Plan\u00e8te rouge en octobre 2016.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>L&#8217;histoire du m\u00e9thane martien a commenc\u00e9 en 2003, quand l&#8217;orbiteur europ\u00e9en Mars Express en a d\u00e9tect\u00e9 pour la premi\u00e8re fois dans l&#8217;atmosph\u00e8re de la Plan\u00e8te rouge. Pour expliquer la pr\u00e9sence de ce compos\u00e9 chimique, les chimistes propos\u00e8rent alors diff\u00e9rente sc\u00e9narios, comme l&#8217;action des rayons ultraviolets sur de la\u00a0mati\u00e8re organique amen\u00e9e par des m\u00e9t\u00e9orites,\u00a0ou la d\u00e9gradation &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/25\/mars-le-mystere-du-methane-reste-entier\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Mars : le myst\u00e8re du m\u00e9thane reste entier<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":1443,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[676,706,708,702,704,553,574,705,115,703,678,575,707],"class_list":["post-1441","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-chimiste","tag-degazage","tag-exomars","tag-mars-express","tag-matiere-organique","tag-meteorite","tag-methane","tag-microbe","tag-planete-rouge","tag-rayon-ultraviolet","tag-rover-curiosity","tag-spectrometre","tag-trace-gas-orbiter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Mars : le myst\u00e8re du m\u00e9thane reste entier<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/25\/mars-le-mystere-du-methane-reste-entier\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mars : le myst\u00e8re du m\u00e9thane reste entier\" \/>\n<meta property=\"og:description\" content=\"L&#8217;histoire du m\u00e9thane martien a commenc\u00e9 en 2003, quand l&#8217;orbiteur europ\u00e9en Mars Express en a d\u00e9tect\u00e9 pour la premi\u00e8re fois dans l&#8217;atmosph\u00e8re de la Plan\u00e8te rouge. 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