{"id":1420,"date":"2014-12-20T09:12:12","date_gmt":"2014-12-20T09:12:12","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1420"},"modified":"2014-12-25T09:02:01","modified_gmt":"2014-12-25T09:02:01","slug":"leau-terrestre-ne-viendrait-pas-des-cometes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/20\/leau-terrestre-ne-viendrait-pas-des-cometes\/","title":{"rendered":"L’eau terrestre ne viendrait pas des com\u00e8tes"},"content":{"rendered":"

L’instrument Rosina (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis<\/em>) install\u00e9 \u00e0 bord de la sonde Rosetta a rendu son verdict : l’eau de la com\u00e8te 67P\/Churyumov-Gerasimenko (sur laquelle le module Philae <\/a>s’est endormi) est tr\u00e8s diff\u00e9rente de l’eau terrestre, comme le r\u00e9v\u00e8le une \u00e9tude publi\u00e9e le 9 d\u00e9cembre dans le magazine Science Express<\/em><\/a>.<\/p>\n

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

On sait depuis longtemps que lorsque la Terre s’est form\u00e9e il y a 4,5 milliards d’ann\u00e9es, elle \u00e9tait s\u00e8che et aride. L’eau (qui recouvre aujourd’hui 70% de sa surface) a \u00e9t\u00e9 amen\u00e9e ensuite, et on pensait jusqu’\u00e0 pr\u00e9sent que cette eau \u00e9tait arriv\u00e9e de l’espace gr\u00e2ce aux\u00a0ast\u00e9ro\u00efdes <\/a>et aux\u00a0com\u00e8tes<\/a>.<\/p>\n

Le spectrom\u00e8tre Rosina, qui a \u00e9tudi\u00e9 les gaz pr\u00e9sents dans l’atmosph\u00e8re de la com\u00e8te Tchouri, a trouv\u00e9 une eau trop riche en deut\u00e9rium. Ce r\u00e9sultat semble donner raison aux partisans des ast\u00e9ro\u00efdes : l’eau qu’ils contiennent pr\u00e9sente un rapport isotopique comparable \u00e0 celui de l’eau terrestre. Les com\u00e8tes n’ont donc sans doute pas jou\u00e9 le r\u00f4le qu’on a longtemps voulu leur faire tenir.<\/p>\n","protected":false},"excerpt":{"rendered":"

L’instrument Rosina (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) install\u00e9 \u00e0 bord de la sonde Rosetta a rendu son verdict : l’eau de la com\u00e8te 67P\/Churyumov-Gerasimenko (sur laquelle le module Philae s’est endormi) est tr\u00e8s diff\u00e9rente de l’eau terrestre, comme le r\u00e9v\u00e8le une \u00e9tude publi\u00e9e le 9 d\u00e9cembre dans le magazine Science Express. On … Continuer la lecture de L’eau terrestre ne viendrait pas des com\u00e8tes<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1421,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[240,125,467,683,681,527,510,684,680,682,471,575,175],"class_list":["post-1420","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-asteroide","tag-atmosphere","tag-comete-churyumov-gerasimenko","tag-deuterium","tag-eau","tag-gaz","tag-philae","tag-rapport-isotopique","tag-rosina","tag-science-express","tag-sonde-rosetta","tag-spectrometre","tag-terre"],"yoast_head":"\nL'eau terrestre ne viendrait pas des com\u00e8tes<\/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\/20\/leau-terrestre-ne-viendrait-pas-des-cometes\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L'eau terrestre ne viendrait pas des com\u00e8tes\" \/>\n<meta property=\"og:description\" content=\"L’instrument Rosina (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) install\u00e9 \u00e0 bord de la sonde Rosetta a rendu son verdict : l’eau de la com\u00e8te 67P\/Churyumov-Gerasimenko (sur laquelle le module Philae s’est endormi) est tr\u00e8s diff\u00e9rente de l’eau terrestre, comme le r\u00e9v\u00e8le une \u00e9tude publi\u00e9e le 9 d\u00e9cembre dans le magazine Science Express. 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