{"id":6392,"date":"2016-10-10T16:27:40","date_gmt":"2016-10-10T16:27:40","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6392"},"modified":"2016-10-18T15:34:55","modified_gmt":"2016-10-18T15:34:55","slug":"tres-jeune-cratere-photographie-mars","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/10\/10\/tres-jeune-cratere-photographie-mars\/","title":{"rendered":"Un tr\u00e8s jeune crat\u00e8re photographi\u00e9 sur Mars"},"content":{"rendered":"<p><strong>La cam\u00e9ra de la sonde spatiale <em>Mars Reconnaissance Orbiter<\/em> (MRO) a photographi\u00e9 un crat\u00e8re qui s&#8217;est form\u00e9 il y a tr\u00e8s peu de temps sur la Plan\u00e8te rouge.<\/strong><\/p>\n<p>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 <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/15\/insolite-le-rover-martien-curiosity-vu-par-lorbiteur-mro\/\" target=\"_blank\">HiRISE <\/a>install\u00e9e \u00e0 bord de l\u2019orbiteur\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/15\/lorbiteur-mro-revele-un-etonnant-cratere-martien\/\" target=\"_blank\">MRO<\/a>. Ce crat\u00e8re, dont les \u00e9jectas ont \u00e9t\u00e9 trait\u00e9s en fausses couleurs pour renforcer les contrastes,\u00a0 est tr\u00e8s r\u00e9cent puisqu\u2019il est pr\u00e9sent sur cette image r\u00e9alis\u00e9e par l&#8217;orbiteur en 2011 mais n\u2019est pas visible sur des images de la m\u00eame r\u00e9gion prises deux ans plus t\u00f4t. 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<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/cratere_mars.jpg\" rel=\"lightbox[6392]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-6393\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/cratere_mars-450x338.jpg\" alt=\"cratere_mars\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/cratere_mars-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/cratere_mars-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/cratere_mars.jpg 960w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>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&#8217;ann\u00e9es. Ce crat\u00e8re a eu la bonne id\u00e9e de se former presque en direct sous l&#8217;\u0153il de MRO !<!--more--><\/p>\n<p>Vous noterez que les \u00e9jectas (constitu\u00e9s de la poussi\u00e8re et les petits blocs projet\u00e9s lors de l&#8217;impact 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 <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/22\/en-video-le-survol-du-pole-sud-de-la-planete-mars\/\" target=\"_blank\">Plan\u00e8te rouge<\/a>.<\/p>\n<p>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 <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Mariner_9\" target=\"_blank\">Mariner 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 <em>Spirit<\/em> ou <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/17\/en-video-11-ans-sur-mars-pour-le-rover-opportunity\/\" target=\"_blank\"><em>Opportunity<\/em> <\/a>et m\u00eame d\u2019effacer en moins d\u2019un mois leurs empreintes de roues !<\/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>La cam\u00e9ra de la sonde spatiale Mars Reconnaissance Orbiter (MRO) a photographi\u00e9 un crat\u00e8re qui s&#8217;est form\u00e9 il y a tr\u00e8s peu de temps 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 &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/10\/10\/tres-jeune-cratere-photographie-mars\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Un tr\u00e8s jeune crat\u00e8re photographi\u00e9 sur Mars<\/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":6393,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[108,1846,770,116,553,771,115],"class_list":["post-6392","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-cratere","tag-ejecta","tag-hirise","tag-mars","tag-meteorite","tag-mro","tag-planete-rouge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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