{"id":21453,"date":"2026-10-12T15:20:00","date_gmt":"2026-10-12T11:20:00","guid":{"rendered":"https:\/\/eternos974.live\/?p=21453"},"modified":"2026-10-11T22:06:40","modified_gmt":"2026-10-11T18:06:40","slug":"mars-comment-expliquer-le-gigantesque-nuage-amec","status":"publish","type":"post","link":"https:\/\/eternos974.live\/index.php\/2026\/10\/12\/mars-comment-expliquer-le-gigantesque-nuage-amec\/","title":{"rendered":"Mars : comment expliquer le gigantesque nuage AMEC ?"},"content":{"rendered":"<p>Le nuage allong\u00e9 d\u2019Arsia Mons, appel\u00e9 AMEC pour Arsia Mons Elongated Cloud, est un nuage de glace d\u2019eau observ\u00e9 de fa\u00e7on r\u00e9currente sur Mars. Il peut s\u2019\u00e9tendre sur environ 1 800 kilom\u00e8tres. Une \u00e9tude publi\u00e9e dans Nature Geoscience propose d\u2019expliquer ses caract\u00e9ristiques \u00e0 l\u2019aide d\u2019un mod\u00e8le atmosph\u00e9rique int\u00e9grant un m\u00e9canisme de formation inhabituel : la nucl\u00e9ation homog\u00e8ne de la vapeur d\u2019eau.<\/p>\n<p>Dans ce m\u00e9canisme, des particules de glace se forment directement \u00e0 partir de la vapeur d\u2019eau, sans noyau pr\u00e9existant tel qu\u2019un grain de poussi\u00e8re. L\u2019\u00e9quipe men\u00e9e par Jorge Hern\u00e1ndez-Bernal montre que l\u2019ajout de ce processus permet de reproduire les caract\u00e9ristiques particuli\u00e8res du nuage, difficiles \u00e0 expliquer avec les approches habituelles. Le relief d\u2019Arsia Mons et les mouvements de l\u2019atmosph\u00e8re jouent un r\u00f4le dans les conditions n\u00e9cessaires \u00e0 sa formation.<\/p>\n<p>Ces r\u00e9sultats soutiennent fortement cette explication, mais il faut distinguer une mod\u00e9lisation des processus microscopiques d\u2019une observation directe de ceux-ci. L\u2019\u00e9tude invite \u00e0 r\u00e9examiner certaines hypoth\u00e8ses sur les nuages d\u2019autres atmosph\u00e8res plan\u00e9taires. Des \u00e9carts subsistent entre le nuage simul\u00e9 et les observations, ce qui laisse des questions ouvertes. L\u2019int\u00e9r\u00eat scientifique tient au m\u00e9canisme propos\u00e9 pour expliquer un nuage d\u00e9j\u00e0 connu.<\/p>\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.numerama.com\/sciences\/2349127-sur-mars-cet-etrange-nuage-est-du-a-un-phenomene-physique-unique-dans-le-systeme-solaire.html\" target=\"_blank\" rel=\"nofollow noopener\">Source 1<\/a><\/li>\n<li><a href=\"https:\/\/www.nature.com\/articles\/s41561-026-02089-9\" target=\"_blank\" rel=\"nofollow noopener\">Source 2<\/a><\/li>\n<li><a href=\"https:\/\/arxiv.org\/abs\/2609.37259\" target=\"_blank\" rel=\"nofollow noopener\">Source 3<\/a><\/li>\n<\/ul>\n<p>\u00c0 tr\u00e8s vite sur <a href=\"https:\/\/eternos974.live\" target=\"_blank\" rel=\"noopener\"><strong>l\u2019EternoStation<\/strong><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une \u00e9tude propose une explication au nuage AMEC pr\u00e8s d\u2019Arsia Mons sur Mars. Un mod\u00e8le reproduit sa formation par nucl\u00e9ation homog\u00e8ne de la vapeur d\u2019eau.<\/p>\n","protected":false},"author":1,"featured_media":21454,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"cybocfi_hide_featured_image":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[393],"tags":[],"class_list":["post-21453","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infos"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"Une \u00e9tude propose une explication au nuage AMEC pr\u00e8s d\u2019Arsia Mons sur Mars. 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