{"id":1400,"date":"2015-01-14T06:07:58","date_gmt":"2015-01-14T06:07:58","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1400"},"modified":"2015-01-19T06:23:53","modified_gmt":"2015-01-19T06:23:53","slug":"que-cache-la-meteorite-de-tissint","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/14\/que-cache-la-meteorite-de-tissint\/","title":{"rendered":"Que cache la m\u00e9t\u00e9orite de Tissint ?"},"content":{"rendered":"

C’est dans la nuit du 18 juillet 2011 que des nomades ont observ\u00e9 la chute d’une m\u00e9t\u00e9orite <\/a>dans le sud du Sahara marocain, \u00e0 proximit\u00e9 de la petite ville de Tissint.<\/p>\n

\"tissint\"<\/a><\/p>\n

7 \u00e0 10 kilos de d\u00e9bris de cette m\u00e9t\u00e9orite ont \u00e9t\u00e9 r\u00e9cup\u00e9r\u00e9s dans les mois qui ont suivi par des collectionneurs et quelques laboratoires.<\/p>\n

On s’est vite rendu compte qu’il s’agissait d’une m\u00e9t\u00e9orite d’origine martienne : \u00a0la composition des bulles de gaz emprisonn\u00e9es dans les parties vitreuses de la m\u00e9t\u00e9orite (le verre est le produit de la fusion de la roche sous l’effet d’un choc violent) est identique \u00e0 celle de l’atmosph\u00e8re de la plan\u00e8te Mars <\/a>mesur\u00e9e par les sondes Viking en 1976.<\/p>\n

Les m\u00e9t\u00e9orites provenant de Mars sont assez rares : seulement une soixantaine sur les 41.000 m\u00e9t\u00e9orites collect\u00e9es dans le monde \u00e0 ce jour ! C’est dire l’enthousiasme des chercheurs qui \u00e9tudient ces roches primitives.<\/p>\n

Les chimistes ont d\u00e9couvert de la mati\u00e8re carbon\u00e9e dans les cavit\u00e9s de la m\u00e9t\u00e9orite de Tissint ; non seulement cette mati\u00e8re carbon\u00e9e n’est pas le fruit d’une contamination terrestre, mais selon une r\u00e9cente\u00a0publication parue dans la revue Meteoritics and Planetary Sciences<\/em>, ce carbone pourrait \u00eatre d’origine biologique. Cette annonce (qui co\u00efncide avec l’exploration du crat\u00e8re Gale<\/a> par le rover Curiosity<\/a>) relance le d\u00e9bat sur la possibilit\u00e9 d’une activit\u00e9 biologique sur Mars dans le pass\u00e9, \u00e0 une \u00e9poque o\u00f9 la plan\u00e8te Rouge devait \u00eatre chaude et humide.<\/p>\n","protected":false},"excerpt":{"rendered":"

C’est dans la nuit du 18 juillet 2011 que des nomades ont observ\u00e9 la chute d’une m\u00e9t\u00e9orite dans le sud du Sahara marocain, \u00e0 proximit\u00e9 de la petite ville de Tissint. 7 \u00e0 10 kilos de d\u00e9bris de cette m\u00e9t\u00e9orite ont \u00e9t\u00e9 r\u00e9cup\u00e9r\u00e9s dans les mois qui ont suivi par des collectionneurs et quelques laboratoires.<\/p>\n","protected":false},"author":8,"featured_media":1401,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[125,676,659,116,677,553,115,678,674,675,673],"class_list":["post-1400","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-atmosphere","tag-chimiste","tag-cratere-gale","tag-mars","tag-matiere-carbonee","tag-meteorite","tag-planete-rouge","tag-rover-curiosity","tag-sahara","tag-sonde-viking","tag-tissint"],"yoast_head":"\nQue cache la m\u00e9t\u00e9orite de Tissint ?<\/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\/2015\/01\/14\/que-cache-la-meteorite-de-tissint\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" 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