{"id":2989,"date":"2015-06-17T04:52:35","date_gmt":"2015-06-17T04:52:35","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2989"},"modified":"2015-06-24T04:50:54","modified_gmt":"2015-06-24T04:50:54","slug":"feu-vert-pour-le-giant-magellan-telescope","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/17\/feu-vert-pour-le-giant-magellan-telescope\/","title":{"rendered":"Feu vert pour le Giant Magellan Telescope"},"content":{"rendered":"<p><strong>Troisi\u00e8me plus grand t\u00e9lescope terrestre en projet, le T\u00e9lescope G\u00e9ant Magellan GMT va sortir de terre dans le d\u00e9sert d&#8217;Atacama au Chili.<\/strong><\/p>\n<p>Ce sont trois t\u00e9lescopes g\u00e9ants qui vont r\u00e9volutionner le monde de l&#8217;astronomie au cours des deux prochaines d\u00e9cennies : l&#8217;E-ELT (pour <em><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/13\/feu-vert-pour-le-telescope-geant-e-elt\/\" target=\"_blank\">European Extremely Large Telescope<\/a><\/em>) construit au Chili par l&#8217;ESO, le TMT (pour <em><a href=\"http:\/\/www.tmt.org\/\" target=\"_blank\">Thirty Meters Telescope<\/a><\/em>) soutenu principalement par les USA et qui trouvera sa place au sommet du Mauna Kea \u00e0 Hawa\u00ef et enfin le <a href=\"http:\/\/www.gmto.org\/\" target=\"_blank\">GMT<\/a>.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/gmt.jpg\" rel=\"lightbox[2989]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-2990\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/gmt-450x337.jpg\" alt=\"gmt\" width=\"450\" height=\"337\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/gmt-450x337.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/gmt-1024x767.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/gmt.jpg 1202w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Si la conception de l&#8217;E-ELT est comparable \u00e0 celle du TMT (un miroir de 39 m form\u00e9\u00a0de 798 \u00e9l\u00e9ments hexagonaux pour le premier, un miroir de 30 m constitu\u00e9 de\u00a0492 segments pour le second), le principe du GMT est diff\u00e9rent.<\/p>\n<p><!--more-->Le GMT sera constitu\u00e9 de 7 miroirs de 8,4 m et 17 tonnes chacun dont la surface collectrice totale sera comparable \u00e0 celle d&#8217;un miroir unique de 24,5 m. Chacun de ces miroirs demandera 4 ans de travail : 1 an pour le coulage du verre et son refroidissement suivi de 3 ans pour son polissage avec une tr\u00e8s haute pr\u00e9cision, l&#8217;objectif \u00e9tant de\u00a0pouvoir ensuite additionner les faisceaux des sept miroirs comme s&#8217;ils ne formaient qu\u2019une seule surface optique.<\/p>\n<p>Initialement le <em>Giant Magellan Telescope<\/em> devait \u00eatre op\u00e9rationnel en 2016 mais son financement a consid\u00e9rablement retard\u00e9 sa r\u00e9alisation. 11 partenaires internationaux viennent de se mettre d&#8217;accord pour lancer les travaux de construction dans le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/31\/alma-deploie-ses-antennes-dans-le-desert-datacama\/\" target=\"_blank\">d\u00e9sert d&#8217;Atacama<\/a> au Chili en d\u00e9bloquant un peu plus de 500 millions de dollars.<\/p>\n<p>Si tout se passe bien ce t\u00e9lescope verra sa premi\u00e8re lumi\u00e8re en 2021 et sera pleinement op\u00e9rationnel en 2024.<\/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>Troisi\u00e8me plus grand t\u00e9lescope terrestre en projet, le T\u00e9lescope G\u00e9ant Magellan GMT va sortir de terre dans le d\u00e9sert d&#8217;Atacama au Chili. Ce sont trois t\u00e9lescopes g\u00e9ants qui vont r\u00e9volutionner le monde de l&#8217;astronomie au cours des deux prochaines d\u00e9cennies : l&#8217;E-ELT (pour European Extremely Large Telescope) construit au Chili par l&#8217;ESO, le TMT (pour &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/17\/feu-vert-pour-le-giant-magellan-telescope\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Feu vert pour le Giant Magellan Telescope<\/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":2990,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[635,634,632,1097,1096,1095],"class_list":["post-2989","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-chili","tag-desert-datacama","tag-e-elt","tag-giant-magellan-telescope","tag-gmt","tag-tmt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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