{"id":764,"date":"2011-12-12T12:29:00","date_gmt":"2011-12-12T11:29:00","guid":{"rendered":"https:\/\/kids.esa.int\/mountains_and_buried_ice_on_mars\/"},"modified":"2026-10-08T00:32:01","modified_gmt":"2026-10-07T22:32:01","slug":"mountains_and_buried_ice_on_mars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/mountains_and_buried_ice_on_mars\/","title":{"rendered":"Des montagnes et de la glace enfouie sur Mars"},"content":{"rendered":"<div class=\"lede\">\n<p>De nouvelles images prises par Mars Express r\u00e9v\u00e8lent une cha\u00eene de montagnes que nous n'avions jamais vue auparavant. Ces montagnes se trouvent dans une zone o\u00f9 les sondages radar indiquent la pr\u00e9sence de grandes quantit\u00e9s de glace d'eau enfouies sous la surface, ce qui pourrait constituer une source d'eau importante pour les futurs astronautes.<\/p>\n<\/div>\n<p>La cha\u00eene montagneuse en question, les monts Phlegra, s'\u00e9tend au Nord-est de la zone volcanique des basses terres du Nord. Les monts proprement dits ne sont probablement pas d'origine volcanique, mais auraient \u00e9t\u00e9 model\u00e9s par d'anciens mouvements tectoniques qui auraient amalgam\u00e9 les diff\u00e9rentes r\u00e9gions de la surface.<\/p>\n<p>De nouvelles images prises par la cam\u00e9ra haute r\u00e9solution de Mars Express, de l'ESA, nous permettent d'observer les montagnes avec beaucoup plus de d\u00e9tails qu'auparavant et nous montrent que presque toutes les montagnes sont entour\u00e9es de \u2018 pans de d\u00e9bris lobul\u00e9s \u2019, c'est-\u00e0-dire des d\u00e9bris rocheux de forme incurv\u00e9e que l'on trouve au pied de falaises comme celles-ci.<\/p>\n<p>Des \u00e9tudes ant\u00e9rieures ont montr\u00e9 que ces roches, qui auraient descendu les pentes des montagnes au fil du temps, \u00e9taient similaires aux d\u00e9bris pr\u00e9sents sur les glaciers sur Terre. Ces observations incitent les scientifiques \u00e0 penser qu'il pourrait y avoir des glaciers enfouis juste sous la surface de Mars.<\/p>\n<p>L'on peut, par ailleurs, observer d\u2019autres indices d'une glaciation relativement r\u00e9cente \u00e0 l'int\u00e9rieur des crat\u00e8res d'impact de la r\u00e9gion. Les s\u00e9ries de dorsales observ\u00e9es se seraient d\u00e9velopp\u00e9es lorsque les anciens crat\u00e8res se sont remplis de neige. Avec le temps, la neige s\u2019est compact\u00e9e et a form\u00e9 des glaciers qui, \u00e0 leur tour, ont sculpt\u00e9 le fond des crat\u00e8res.<\/p>\n<p>Tous ces \u00e9l\u00e9ments portent les chercheurs \u00e0 croire qu\u2019il pourrait y avoir de grandes quantit\u00e9s de glace hydrique juste en-dessous de la surface des Monts Phlegra. Si cela \u00e9tait vrai, ces champs de glace pourraient fournir aux futurs astronautes une source d\u2019eau importante sur la Plan\u00e8te rouge.<\/p>","protected":false},"excerpt":{"rendered":"<p>New images from Mars Express show a mountain range we haven&#8217;t seen before. The mountains are in an area where radar probing shows us that large amounts of water ice [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2011\/12\/phlegramontes2\/18249880-2-eng-GB\/PhlegraMontes.jpg","esa_banner_description":"","esa_banner_credit":"ESA\/DLR\/FU Berlin (G. 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