{"id":9275,"date":"2018-05-24T17:17:39","date_gmt":"2018-05-24T17:17:39","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9275"},"modified":"2018-06-06T13:59:01","modified_gmt":"2018-06-06T13:59:01","slug":"meteorites-heurtent-toujours-sol-martien","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/05\/24\/meteorites-heurtent-toujours-sol-martien\/","title":{"rendered":"Des m\u00e9t\u00e9orites heurtent toujours le sol martien"},"content":{"rendered":"

La cam\u00e9ra de la sonde spatiale\u00a0Mars Reconnaissance Orbiter<\/em>\u00a0(MRO) a photographi\u00e9 un crat\u00e8re creus\u00e9 r\u00e9cemment par une m\u00e9t\u00e9orite sur la Plan\u00e8te rouge.<\/strong><\/p>\n

D\u00e9couvrir un nouveau crat\u00e8re d\u2019impact sur Mars est assez rare et toujours passionnant pour les plan\u00e9tologues. C\u2019est le cas sur l\u2019image ci-dessous qui a \u00e9t\u00e9 obtenue gr\u00e2ce \u00e0 la cam\u00e9ra\u00a0HiRISE\u00a0<\/a>install\u00e9e \u00e0 bord de l\u2019orbiteur\u00a0MRO<\/a>. Ce crat\u00e8re (d’environ 7 m\u00e8tres de diam\u00e8tre) est tr\u00e8s r\u00e9cent puisqu\u2019il est apparu entre deux survols de l’orbiteur en 2006 et 2011. En per\u00e7ant la couche claire superficielle, la m\u00e9t\u00e9orite qui est tomb\u00e9e l\u00e0 a fait jaillir du sous-sol de la poussi\u00e8re plus sombre.<\/p>\n

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

En g\u00e9n\u00e9ral les plan\u00e9tologues, gens tr\u00e8s patients, observent des changements \u00e0 la surface des astres sur des dur\u00e9es beaucoup plus longues qui se chiffrent en milliers, voire millions d\u2019ann\u00e9es. Ce crat\u00e8re a eu la bonne id\u00e9e de se former presque en direct sous l\u2019\u0153il de MRO !<\/span><\/p>\n

Vous noterez que les \u00e9jectas (constitu\u00e9s de la poussi\u00e8re et les petits blocs projet\u00e9s lors de l\u2019impact m\u00e9t\u00e9oritique) ne sont pas r\u00e9partis sym\u00e9triquement autour du crat\u00e8re. Ils ont \u00e9t\u00e9 d\u00e9pos\u00e9s de cette fa\u00e7on par le vent dont on conna\u00eet les effets vari\u00e9s sur la\u00a0Plan\u00e8te rouge<\/a>.<\/p>\n

Outre les grandes temp\u00eates de poussi\u00e8re qui cachent parfois les reliefs martiens pendant plusieurs semaines (comme en 1971 lors de l\u2019arriv\u00e9e en orbite de\u00a0Mariner 9<\/a>), il existe une grande vari\u00e9t\u00e9 de vents qui fa\u00e7onnent le relief de Mars. Certains sont capables de nettoyer en quelques semaines la poussi\u00e8re d\u00e9pos\u00e9e sur les panneaux solaires des astromobiles comme\u00a0Spirit<\/em>\u00a0ou\u00a0Opportunity<\/em>\u00a0<\/a>et m\u00eame d\u2019effacer en moins d\u2019un mois leurs empreintes de roues !<\/p>\n","protected":false},"excerpt":{"rendered":"

La cam\u00e9ra de la sonde spatiale\u00a0Mars Reconnaissance Orbiter\u00a0(MRO) a photographi\u00e9 un crat\u00e8re creus\u00e9 r\u00e9cemment par une m\u00e9t\u00e9orite sur la Plan\u00e8te rouge. D\u00e9couvrir un nouveau crat\u00e8re d\u2019impact sur Mars est assez rare et toujours passionnant pour les plan\u00e9tologues. C\u2019est le cas sur l\u2019image ci-dessous qui a \u00e9t\u00e9 obtenue gr\u00e2ce \u00e0 la cam\u00e9ra\u00a0HiRISE\u00a0install\u00e9e \u00e0 bord de l\u2019orbiteur\u00a0MRO. … Continuer la lecture de Des m\u00e9t\u00e9orites heurtent toujours le sol martien<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9276,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[770,116,553,771,115],"class_list":["post-9275","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-hirise","tag-mars","tag-meteorite","tag-mro","tag-planete-rouge"],"yoast_head":"\nDes m\u00e9t\u00e9orites heurtent toujours le sol martien<\/title>\n<meta name=\"description\" content=\"La cam\u00e9ra de la sonde spatiale\u00a0Mars Reconnaissance Orbiter\u00a0(MRO) a photographi\u00e9 un crat\u00e8re 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