{"id":5800,"date":"2016-06-07T15:15:28","date_gmt":"2016-06-07T15:15:28","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5800"},"modified":"2016-06-16T15:45:49","modified_gmt":"2016-06-16T15:45:49","slug":"insolite-grotte-martienne-vue-mro","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/07\/insolite-grotte-martienne-vue-mro\/","title":{"rendered":"Insolite\u00a0: une grotte martienne vue par MRO"},"content":{"rendered":"<p><strong>L&#8217;orbiteur MRO a photographi\u00e9 une grotte martienne, une cavit\u00e9 qui est apparue suite \u00e0 l&#8217;effondrement du plancher au fond d&#8217;un crat\u00e8re d&#8217;impact.<\/strong><\/p>\n<p>On connaissait les grottes lunaires, des puits naturels qui correspondent \u00e0 d&#8217;anciens tubes de lave dont le plafond s&#8217;est affaiss\u00e9. C&#8217;est la sonde lunaire am\u00e9ricaine <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/13\/en-video-une-breve-histoire-de-la-formation-de-la-lune\/\" target=\"_blank\">LRO<\/a> (<em>Lunar Reconnaissance Orbiter<\/em>) qui les a d\u00e9busqu\u00e9es il y a quelques ann\u00e9es, les deux plus connues se trouvant dans <em>Marius Hills<\/em>, une r\u00e9gion de l&#8217;oc\u00e9an des Temp\u00eates et dans <em>Mare Ingenii<\/em> sur la face cach\u00e9e.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" frameborder=\"0\" width=\"480\" height=\"270\" src=\"\/\/www.dailymotion.com\/embed\/video\/x3wyfdx\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p style=\"text-align: center\"><strong>En vid\u00e9o : 10 ans d&#8217;images de la Plan\u00e8te rouge prises par MRO<\/strong><\/p>\n<p>Il semble que de telles formations g\u00e9ologiques se rencontrent \u00e9galement sur la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/05\/22\/pleine-lune-lopposition-de-planete-mars\/\" target=\"_blank\">Plan\u00e8te rouge<\/a>. Sur cette image obtenue par l&#8217;orbiteur <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/24\/mro-detecte-du-verre-a-la-surface-de-mars\/\" target=\"_blank\">MRO <\/a>(<em>Mars Reconnaissance Orbiter<\/em>) on aper\u00e7oit un trou au fond d&#8217;un crat\u00e8re d&#8217;impact sur les flans de <em>Pavonis Mons<\/em>, un volcan bouclier situ\u00e9 au niveau de l&#8217;\u00e9quateur de la plan\u00e8te <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/04\/15\/sur-la-planete-mars-le-vent-fait-son-oeuvre\/\" target=\"_blank\">Mars<\/a>. Cette grotte souterraine a une ouverture de 35 m\u00e8tres de diam\u00e8tre et une profondeur de 20 m\u00e8tres (le fond est en partie \u00e9clair\u00e9 par la lumi\u00e8re solaire).<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/grotte-mars.jpg\" rel=\"lightbox[5800]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5801\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/grotte-mars-450x277.jpg\" alt=\"grotte-mars\" width=\"450\" height=\"277\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/grotte-mars-450x277.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/grotte-mars-768x473.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/grotte-mars.jpg 960w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Les scientifiques pensent que de telles grottes sont particuli\u00e8rement favorables pour permettre le d\u00e9veloppement et la persistance de la vie car elles peuvent maintenir des conditions d&#8217;environnement stable pendant un long moment. <!--more--><\/p>\n<p>Ces cavit\u00e9s souterraines sont tr\u00e8s probablement des grottes de glace qui conservent la neige accumul\u00e9e par le vent car elles fonctionnent comme des \u00ab\u00a0pi\u00e8ges \u00e0 froid\u00a0\u00bb\u00a0: l&#8217;hiver, l&#8217;air dans la grotte, plus chaud que l&#8217;air ext\u00e9rieur, est chass\u00e9 vers le haut et remplac\u00e9 par l&#8217;air froid ext\u00e9rieur plus dense. L&#8217;\u00e9t\u00e9 l&#8217;air dans la grotte a tendance \u00e0 \u00eatre plus froid que l&#8217;air ext\u00e9rieur et continue de rester dans la grotte. Une \u00e9paisseur d&#8217;un m\u00e8tre du plafond de la grotte suffit \u00e0 l&#8217;isoler thermiquement de l&#8217;ext\u00e9rieur. Un tel syst\u00e8me de glaci\u00e8re pourrait permettre de conserver de l&#8217;eau gel\u00e9e pendant plusieurs dizaines de milliers d&#8217;ann\u00e9es sans nouvelle accumulation de neige\u00a0!<\/p>\n<p>Ces cavit\u00e9s souterraines qui font fantasmer les plan\u00e9tologues (ils r\u00eavent d&#8217;aller les explorer) pourraient \u00e9galement se r\u00e9v\u00e9ler utiles pour de futurs colonisateurs de la Plan\u00e8te rouge car elles offriraient une protection naturelle en cas de violente <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/09\/11\/eruption-solaire-du-10-septembre\/\" target=\"_blank\">\u00e9ruption solaire<\/a>.<\/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>L&#8217;orbiteur MRO a photographi\u00e9 une grotte martienne, une cavit\u00e9 qui est apparue suite \u00e0 l&#8217;effondrement du plancher au fond d&#8217;un crat\u00e8re d&#8217;impact. On connaissait les grottes lunaires, des puits naturels qui correspondent \u00e0 d&#8217;anciens tubes de lave dont le plafond s&#8217;est affaiss\u00e9. C&#8217;est la sonde lunaire am\u00e9ricaine LRO (Lunar Reconnaissance Orbiter) qui les a d\u00e9busqu\u00e9es &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/07\/insolite-grotte-martienne-vue-mro\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Insolite\u00a0: une grotte martienne vue par MRO<\/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":5801,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1662,1660,116,771,1661,115],"class_list":["post-5800","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-glaciere","tag-grotte-martienne","tag-mars","tag-mro","tag-pavonis-mons","tag-planete-rouge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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