{"id":2979,"date":"2015-06-15T04:55:50","date_gmt":"2015-06-15T04:55:50","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2979"},"modified":"2015-06-22T04:32:21","modified_gmt":"2015-06-22T04:32:21","slug":"penitents-de-glace-sous-les-etoiles-dans-le-desert-datacama","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/15\/penitents-de-glace-sous-les-etoiles-dans-le-desert-datacama\/","title":{"rendered":"P\u00e9nitents de glace sous les \u00e9toiles dans le d\u00e9sert d&#8217;Atacama"},"content":{"rendered":"<p><strong>Au Chili, dans le d\u00e9sert le plus aride et le plus haut du monde, les conditions atmosph\u00e9riques donnent parfois naissance \u00e0 d&#8217;\u00e9tranges structures de glace, des p\u00e9nitents.\u00a0<\/strong><\/p>\n<p>Le d\u00e9sert d&#8217;Atacama accueille depuis plusieurs d\u00e9cennies les plus grands <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/13\/resolution-record-pour-une-observation-visuelle\/\" target=\"_blank\">t\u00e9lescopes <\/a>du monde, dont ceux de l&#8217;<a href=\"http:\/\/www.eso.org\/public\/france\/images\/potw1522a\/\" target=\"_blank\">ESO<\/a>. Si l&#8217;endroit est devenu un haut lieu de l&#8217;astronomie, c&#8217;est parce que les conditions y sont exceptionnelles pour les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\">astronomes <\/a>: absence presque totale de pr\u00e9cipitations et ciel nocturne d&#8217;une incroyable puret\u00e9, loin de toute source de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/06\/28\/pollution-lumineuse\/\" target=\"_blank\">pollution lumineuse<\/a>.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/penitents_eso.jpg\" rel=\"lightbox[2979]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-2981\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/penitents_eso-450x337.jpg\" alt=\"penitents_eso\" width=\"450\" height=\"337\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/penitents_eso-450x337.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/penitents_eso-1024x767.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/penitents_eso.jpg 1201w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Dans le d\u00e9sert d&#8217;Atacama, il arrive parfois que la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/12\/insolite-il-neige-lobservatoire-de-la-silla\/\" target=\"_blank\">neige <\/a>tombe. Ph\u00e9nom\u00e8ne beaucoup plus rare et encore mal compris, on peut alors observer la formation de lame de glace orient\u00e9es dans la m\u00eame direction, les p\u00e9nitents de glace.<\/p>\n<p><!--more-->Leur hauteur varie de quelques d\u00e9cim\u00e8tres \u00e0 quelques m\u00e8tres et ils font penser aux processions des nazarenos, ces p\u00e9nitents coiff\u00e9s de leur chapeau pointu qui d\u00e9filent dans les rues de S\u00e9ville pendant la Semaine sainte.<\/p>\n<p>Contrairement \u00e0 ce qu&#8217;on pourrait penser, le vent (souvent violent dans cette partie du globe) ne semble pas jouer un grand r\u00f4le dans la formation des p\u00e9nitents de glace ; c&#8217;est sans doute l&#8217;action du Soleil associ\u00e9e \u00e0 un air tr\u00e8s sec qui sculpte la glace par sublimation (elle passe directement de l&#8217;\u00e9tat solide \u00e0 l&#8217;\u00e9tat gazeux).<\/p>\n<p>Cette image, r\u00e9alis\u00e9e par l&#8217;astrophotographe\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/13\/en-video-le-kilimanjaro-sous-les-etoiles\/\" target=\"_blank\">Babak Amin Tafreshi<\/a>, montre \u00e9galement le ciel \u00e9toil\u00e9 au-dessus des p\u00e9nitents, avec de gauche \u00e0 droite l&#8217;amas d&#8217;\u00e9toiles des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/22\/le-coronographe-de-soho-devoile-lamas-des-pleiades\/\" target=\"_blank\">Pl\u00e9iades<\/a>, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/22\/le-croissant-de-lune-surplombe-etoile-aldebaran\/\" target=\"_blank\">Ald\u00e9baran<\/a> et l&#8217;amas des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/25\/la-lune-sous-les-hyades-et-les-pleiades\/\" target=\"_blank\">Hyades<\/a>, la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/09\/15\/constellation-dorion\/\" target=\"_blank\">constellation d&#8217;Orion<\/a> et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/11\/sirius-brille-au-dessus-du-monastere-grec-de-giromeri\/\" target=\"_blank\">Sirius<\/a>, l&#8217;\u00e9toile la plus brillante du ciel.<\/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>Au Chili, dans le d\u00e9sert le plus aride et le plus haut du monde, les conditions atmosph\u00e9riques donnent parfois naissance \u00e0 d&#8217;\u00e9tranges structures de glace, des p\u00e9nitents.\u00a0 Le d\u00e9sert d&#8217;Atacama accueille depuis plusieurs d\u00e9cennies les plus grands t\u00e9lescopes du monde, dont ceux de l&#8217;ESO. Si l&#8217;endroit est devenu un haut lieu de l&#8217;astronomie, c&#8217;est parce &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/15\/penitents-de-glace-sous-les-etoiles-dans-le-desert-datacama\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">P\u00e9nitents de glace sous les \u00e9toiles dans le d\u00e9sert d&#8217;Atacama<\/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":2981,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[863,713,841,635,354,634,633,410],"class_list":["post-2979","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-amas-des-hyades","tag-amas-des-pleiades","tag-babak-tafreshi","tag-chili","tag-constellation-dorion","tag-desert-datacama","tag-eso","tag-sirius"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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