{"id":5965,"date":"2016-06-28T15:07:53","date_gmt":"2016-06-28T15:07:53","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5965"},"modified":"2016-07-16T13:29:39","modified_gmt":"2016-07-16T13:29:39","slug":"mro-deniche-sur-mars-deux-tres-jeunes-crateres-noirs","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/28\/mro-deniche-sur-mars-deux-tres-jeunes-crateres-noirs\/","title":{"rendered":"MRO d\u00e9niche sur Mars deux tr\u00e8s jeunes crat\u00e8res noirs"},"content":{"rendered":"

La cam\u00e9ra de la sonde spatiale Mars Reconnaissance Orbiter<\/em> (MRO) a photographi\u00e9\u00a0deux minuscules crat\u00e8res\u00a0qui sont apparus il y a seulement quelques ann\u00e9es.<\/strong><\/p>\n

D\u00e9couvrir de nouveaux crat\u00e8res d’impact sur Mars est assez rare et toujours passionnant pour les plan\u00e9tologues. C’est le cas sur l\u2019image ci-dessous, pr\u00e9sent\u00e9e sur le blog de Lori Fenton<\/a>, qui a \u00e9t\u00e9 obtenue gr\u00e2ce \u00e0 la cam\u00e9ra HiRISE <\/a>install\u00e9e \u00e0 bord de l\u2019orbiteur\u00a0MRO<\/a>.\u00a0Les deux petits crat\u00e8res sombres ont chacun un diam\u00e8tre l\u00e9g\u00e8rement sup\u00e9rieur \u00e0 2 m\u00e8tres. Ils sont tr\u00e8s r\u00e9cents puisqu’ils sont apparus sur des images prises en avril 2008 alors qu’ils n’\u00e9taient pas visibles un an plus t\u00f4t. En per\u00e7ant la couche claire superficielle, les deux m\u00e9t\u00e9orites qui sont tomb\u00e9es l\u00e0 ont fait jaillir du sous-sol de la poussi\u00e8re plus sombre que le vent a ensuite \u00e9tal\u00e9.<\/p>\n

\"dark-crater\"<\/a><\/p>\n

On sait depuis bien longtemps que les vents soufflent sur la Plan\u00e8te rouge<\/a>. Depuis que les t\u00e9lescopes terrestres sont assez puissants pour observer les grands reliefs martiens, les astronomes ont assist\u00e9 \u00e0 plusieurs temp\u00eates suffisamment importantes pour soulever de grandes quantit\u00e9s de poussi\u00e8res et masquer les paysages durant plusieurs semaines sur Mars. En 1971 une temp\u00eate se produisit lors de l\u2019arriv\u00e9e en orbite martienne de Mariner 9<\/a>, obligeant la NASA <\/a>\u00e0 retarder le travail cartographique assign\u00e9 \u00e0 la sonde.<\/p>\n

En plus de ces temp\u00eates spectaculaires il existe une grande vari\u00e9t\u00e9 de vents qui fa\u00e7onnent le relief de la plan\u00e8te Mars. Certains sont capables de nettoyer en quelques semaines la poussi\u00e8re d\u00e9pos\u00e9e sur les panneaux solaires des astromobiles comme Spirit<\/em> ou Opportunity<\/em> <\/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 Mars Reconnaissance Orbiter (MRO) a photographi\u00e9\u00a0deux minuscules crat\u00e8res\u00a0qui sont apparus il y a seulement quelques ann\u00e9es. D\u00e9couvrir de nouveaux crat\u00e8res d’impact sur Mars est assez rare et toujours passionnant pour les plan\u00e9tologues. C’est le cas sur l\u2019image ci-dessous, pr\u00e9sent\u00e9e sur le blog de Lori Fenton, qui a \u00e9t\u00e9 obtenue … Continuer la lecture de MRO d\u00e9niche sur Mars deux tr\u00e8s jeunes crat\u00e8res noirs<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":5966,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[770,1560,1561,116,771,486,776,115,1709],"class_list":["post-5965","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-hirise","tag-lori-fenton","tag-mariner-9","tag-mars","tag-mro","tag-nasa","tag-opportunity","tag-planete-rouge","tag-spirit"],"yoast_head":"\nMRO d\u00e9niche sur Mars deux tr\u00e8s jeunes crat\u00e8res noirs<\/title>\n<meta name=\"description\" content=\"La cam\u00e9ra de la sonde spatiale Mars Reconnaissance Orbiter (MRO) a 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