{"id":8709,"date":"2018-02-12T07:40:11","date_gmt":"2018-02-12T07:40:11","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=8709"},"modified":"2018-02-21T07:52:13","modified_gmt":"2018-02-21T07:52:13","slug":"glissements-de-terrain-pentes-vallees-martiennes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/02\/12\/glissements-de-terrain-pentes-vallees-martiennes\/","title":{"rendered":"Glissements de terrain sur les pentes des vall\u00e9es martiennes"},"content":{"rendered":"<p><strong>La cam\u00e9ra plac\u00e9e \u00e0 bord de l&#8217;orbiteur martien MRO a photographi\u00e9 des glissements de terrain sur les pentes de certaines vall\u00e9es.\u00a0<\/strong><\/p>\n<p>Alors que les astronomes se pr\u00e9parent pour la prochaine opposition martienne (la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/01\/14\/jupiter-mars-a-laube-13-janvier-vieille-lune\/\" target=\"_blank\" rel=\"noopener\">Plan\u00e8te rouge<\/a> sera au plus pr\u00e8s de la Terre le 27 juillet 2018), les plan\u00e9tologues continuent d&#8217;\u00e9tudier la surface de la quatri\u00e8me plan\u00e8te du Syst\u00e8me solaire gr\u00e2ce \u00e0\u00a0l\u2019orbiteur am\u00e9ricain\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/15\/lorbiteur-mro-revele-un-etonnant-cratere-martien\/\" target=\"_blank\" rel=\"noopener noreferrer\">MRO<\/a>\u00a0(<em>Mars Reconnaissance Orbiter<\/em>).<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/01\/mars.jpg\" rel=\"lightbox[8709]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-8710\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/01\/mars-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/01\/mars-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/01\/mars-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/01\/mars-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/01\/mars.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Si l&#8217;instrument CRISM (<em>Compact Reconnaissance Imaging Spectrometer for Mars<\/em>) a beaucoup fait parler de lui ces derniers temps (il a permis de confirmer <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-mars-glace-decouverte-grande-quantite-sous-surface-18025\/\" target=\"_blank\" rel=\"noopener\">la pr\u00e9sence de glace en grande quantit\u00e9 sous la surface<\/a>), c&#8217;est\u00a0la cam\u00e9ra\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/15\/insolite-le-rover-martien-curiosity-vu-par-lorbiteur-mro\/\" target=\"_blank\" rel=\"noopener noreferrer\">HiRISE\u00a0<\/a>qui a r\u00e9alis\u00e9 cette curieuse photo obtenue lors d&#8217;un survol de la r\u00e9gion d&#8217;<em>Acheron Fossae<\/em>, une d\u00e9pression qui s&#8217;\u00e9tire sur 700 km de long et qui se situe au nord d&#8217;<a href=\"https:\/\/www.futura-sciences.com\/sciences\/videos\/olympus-mons-mars-plus-grand-volcan-systeme-solaire-1879\/\" target=\"_blank\" rel=\"noopener\"><em>Olympus Mons<\/em><\/a>, le plus grand volcan du Syst\u00e8me solaire.\u00a0\u00a0<!--more--><\/p>\n<p>Sur ce clich\u00e9 r\u00e9alis\u00e9 depuis une altitude de 290 km, on observe de nombreuses tra\u00een\u00e9es sombres sur les pentes plus claires de la d\u00e9pression. Les scientifiques pensent que du sable clair tr\u00e8s fluide (il contourne les rochers) se met \u00e0 glisser sur plusieurs centaines de m\u00e8tres sans qu&#8217;on sache encore vraiment quel processus le met en mouvement, r\u00e9v\u00e9lant au passage une sous-couche plus sombre. On remarque que certaines zones d&#8217;\u00e9coulement se sont \u00e9claircies, une autre question actuellement sans r\u00e9ponse. Comme il n&#8217;y a pas de d\u00e9p\u00f4t visible au pied de ces \u00e9coulements, on peut penser que cette couche mobile est extr\u00eamement fine.<\/p>\n<p>Rappelons que la sonde am\u00e9ricaine MRO est en orbite autour de la Plan\u00e8te rouge depuis le mois de mars 2006. Cet engin de plus de 2 tonnes est dot\u00e9 de diff\u00e9rents instruments scientifiques : 3 cam\u00e9ras (HiRISE, CTX et MARCI), un spectrom\u00e8tre (CRISM), un radiom\u00e8tre (MCS) et un radar (SHARAD).<\/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 plac\u00e9e \u00e0 bord de l&#8217;orbiteur martien MRO a photographi\u00e9 des glissements de terrain sur les pentes de certaines vall\u00e9es.\u00a0 Alors que les astronomes se pr\u00e9parent pour la prochaine opposition martienne (la Plan\u00e8te rouge sera au plus pr\u00e8s de la Terre le 27 juillet 2018), les plan\u00e9tologues continuent d&#8217;\u00e9tudier la surface de la quatri\u00e8me &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/02\/12\/glissements-de-terrain-pentes-vallees-martiennes\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Glissements de terrain sur les pentes des vall\u00e9es martiennes<\/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":8710,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[2414,2415,770,116,771,115],"class_list":["post-8709","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-acheron-fossae","tag-crism","tag-hirise","tag-mars","tag-mro","tag-planete-rouge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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