{"id":4739,"date":"2017-03-02T00:00:00","date_gmt":"2017-03-01T23:00:00","guid":{"rendered":"https:\/\/frenchdistrict.com\/californie-nord\/articles\/the-allen-telescope-array-a-mountain-view\/"},"modified":"2024-11-15T06:40:35","modified_gmt":"2024-11-15T14:40:35","slug":"the-allen-telescope-array-a-mountain-view","status":"publish","type":"post","link":"https:\/\/frenchdistrict.com\/californie-nord\/articles\/the-allen-telescope-array-a-mountain-view\/","title":{"rendered":"Le Allen Telescope Array"},"content":{"rendered":"<h2>SETI qu\u2019il y a des aliens ou pas\u00a0?<\/h2>\n<p><strong>SETI<\/strong>, c\u2019est la <em>Search of Extraterrestrial Intelligence<\/em>, et donc\u00a0tous les moyens mis en \u0153uvre pour chercher (on a pas dit \u00ab\u00a0trouver\u00a0\u00bb) et d\u00e9tecter des <strong>signes de vie extraterrestre<\/strong>. Mis en place dans les ann\u00e9es 60, ce programme analyse les <strong>spectres \u00e9lectromagn\u00e9tiques<\/strong> qui se baladent dans l\u2019espace et tente de d\u00e9terminer s\u2019ils peuvent constituer des <strong>signaux \u00e9mis par des extraterrestres<\/strong>, de fa\u00e7on volontaire ou non.<\/p>\n<p>Les ann\u00e9es 60 ont donc amen\u00e9 plus que les Beach Boys et le Concorde\u00a0: c\u2019est aussi l\u00e0\u00a0que, sous l\u2019impulsion de <strong>Frank Drake<\/strong>, un radiot\u00e9l\u00e9scope commence \u00e0 rechercher des signaux artificiels, sur la fr\u00e9quence de l\u2019hydrog\u00e8ne, soit 1 420 MHz (si jamais vous voulez vous lancer aussi ; plus on est de fous, plus on a de chance de contacter E.T.).<\/p>\n<p>L\u2019id\u00e9e ne s\u2019est concr\u00e9tis\u00e9e qu\u2019au d\u00e9but des ann\u00e9es 2000 cependant, apr\u00e8s une g\u00e9n\u00e9reuse donation de la Fondation Paul Allen et <strong>Paul Allen<\/strong> lui-m\u00eame (co-fondateur de Microsoft), et le <strong>Allen Telescope Array<\/strong> (ATA) sortait de terre en 2007, plein de projets.<\/p>\n<h2>All\u00f4, l\u2019univers\u00a0? Ici la Terre<\/h2>\n<p>Et ce n\u2019\u00e9tait pas un petit projet. L\u2019<strong>ATA<\/strong> se compose de 42 antennes, suivant le concept de LNSD (\u00ab\u00a0<em>Large Number of Small Dishes<\/em>\u00a0\u00bb) plut\u00f4t d\u2019un immense radar. Le projet\u00a0? Avoir \u2013 un jour \u2013 350 antennes, ce qui reviendrait \u00e0 collecter des infos sur une surface de 114 m\u00e8tres de diam\u00e8tres.<\/p>\n<div id=\"attachment_164263\" style=\"width: 820px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/frenchdistrict.com\/californie-nord\/wp-content\/uploads\/sites\/6\/2017\/03\/allen-telescope-array-yeti.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-164263\" class=\"size-large wp-image-164263\" src=\"https:\/\/frenchdistrict.com\/californie-nord\/wp-content\/uploads\/sites\/6\/2017\/03\/allen-telescope-array-yeti-1024x768.jpg\" alt=\"Le Allen Telescope Array \u00e0 Hat Creek, Californie\" width=\"810\" height=\"608\" srcset=\"https:\/\/frenchdistrict.com\/californie-nord\/wp-content\/uploads\/sites\/6\/2017\/03\/allen-telescope-array-yeti-1024x768.jpg 1024w, https:\/\/frenchdistrict.com\/californie-nord\/wp-content\/uploads\/sites\/6\/2017\/03\/allen-telescope-array-yeti-300x225.jpg 300w, https:\/\/frenchdistrict.com\/californie-nord\/wp-content\/uploads\/sites\/6\/2017\/03\/allen-telescope-array-yeti-768x576.jpg 768w, https:\/\/frenchdistrict.com\/californie-nord\/wp-content\/uploads\/sites\/6\/2017\/03\/allen-telescope-array-yeti-1536x1152.jpg 1536w, https:\/\/frenchdistrict.com\/californie-nord\/wp-content\/uploads\/sites\/6\/2017\/03\/allen-telescope-array-yeti-810x608.jpg 810w, https:\/\/frenchdistrict.com\/californie-nord\/wp-content\/uploads\/sites\/6\/2017\/03\/allen-telescope-array-yeti-1140x855.jpg 1140w, https:\/\/frenchdistrict.com\/californie-nord\/wp-content\/uploads\/sites\/6\/2017\/03\/allen-telescope-array-yeti.jpg 1600w\" sizes=\"auto, (max-width: 810px) 100vw, 810px\" \/><\/a><p id=\"caption-attachment-164263\" class=\"wp-caption-text\">Le Allen Telescope Array \u00e0 Hat Creek, Californie. <span style=\"font-size: 12px; font-style: italic;\">Cr\u00e9dit photo : <a style=\"color: #3d5185; text-decoration: none;\" href=\"https:\/\/www.flickr.com\/photos\/springfieldhomer\/7783440210\" target=\"_blank\" rel=\"noopener\">Bruce Fingerhood<\/a> (<a style=\"color: #3d5185; text-decoration: none;\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc\/2.0\/\" target=\"_blank\" rel=\"noopener\">CC BY-NC 2.0<\/a>)<\/span><\/p><\/div>\n<p>Le <strong>Allen Telescope Array<\/strong> se situe dans les Cascade Mountain, entre le<a title=\"Skier sur un volcan : le Mt Shasta\" href=\"http:\/\/frenchdistrict.com\/californie-nord\/articles\/skier-volcan-mont-shasta\/\" target=\"_blank\" rel=\"noopener\"> <i class=\"fa fa-link\" aria-hidden=\"true\"><\/i> Mt Shasta<\/a> et le Mt Lassen, au nord du <a title=\"Le parc volcanique de Lassen\" href=\"http:\/\/frenchdistrict.com\/californie-nord\/articles\/parc-volcanique-lassen-lac-montagne-bumpass-hell\/\" target=\"_blank\" rel=\"noopener\">Lassen Park<\/a>. Il peut capter des fr\u00e9quences entre 500 et 10 000 MHz, et, comme la plupart des programmes de SETI depuis les 50 derni\u00e8res ann\u00e9es, le ATA en envoie de fa\u00e7on non intentionnelle aussi dans l\u2019espace.<\/p>\n<p>L\u2019ATA ne s\u2019embarque cependant pas dans une grande conversation avec <strong>l\u2019univers<\/strong>\u00a0: ce genre d\u2019\u00e9change n\u2019a rien d\u2019un petit SMS aussit\u00f4t envoy\u00e9-aussit\u00f4t lu\u00a0; on parle ici d\u2019un message envoy\u00e9 \u00e0 une <strong>centaine d\u2019ann\u00e9es lumi\u00e8res<\/strong>, dont une r\u00e9ponse prendrait\u00a0environ 200 ans \u00a0\u00e0 nous parvenir. Pas le moment de les inviter pour une raclette demain soir donc &#8211; c\u2019est pourquoi les programmes de SETI ne cherchent pas (encore) \u00e0 envoyer des signaux ou des messages de fa\u00e7on d\u00e9lib\u00e9r\u00e9e dans l\u2019espace.<\/p>\n<p>L\u2019<strong>ATA<\/strong> ne fait pas que tailler le bout de gras avec des <strong>extraterrestres<\/strong>. Il se concentre aussi sur des missions pas \u00e0 la port\u00e9e du premier b\u00e9otien\u2026 Pourriez-vous, par exemple, explorer le ciel transitoire \u00e0 la recherche de <strong>trous noirs<\/strong>\u00a0? Mesurer les champs magn\u00e9tiques de la Voie Lact\u00e9e\u00a0? D\u00e9tecter des ondes gravitationnelles, ou vibrations de l\u2019espace-temps (pr\u00e9dites par Einstein et d\u2019ailleurs d\u00e9tect\u00e9e en f\u00e9vrier 2016)\u00a0?<\/p>\n<p>Non\u00a0?<br \/>\nRassurez-vous, des sp\u00e9cialistes s\u2019en chargent pour vous.<\/p>\n<div style=\"display:block;\"><h3>Infos Pratiques <\/h3><div class=\"infos-listing\" itemscope itemtype=\"https:\/\/schema.org\/Thing\"><div class=\"article-info address infos-listing__address\" style=\"padding-bottom:1em;\" itemprop=\"location\" itemscope itemtype=\"https:\/\/schema.org\/Place\"><strong itemprop=\"name\"><i class=\"fa fa-map-marker\" aria-hidden=\"true\"><\/i>The Allen Telescope Array<\/strong><br><div itemprop=\"address\" itemscope itemtype=\"https:\/\/schema.org\/PostalAddress\"><span itemprop=\"streetAddress\">Hat Creek Radio Observatory<\/span>,<span>42231 Bidwell Road<\/span><br><span itemprop=\"addressLocality\">Hat Creek<\/span>,\r\n\t\t\t\t\t\t<span itemprop=\"addressRegion\"> CA<\/span>, <span itemprop=\"postalCode\">96040<\/span><\/div>\r\n\t\t\t\t<\/div><div class=\"article-info infos-listing__contact\"><a href=\"tel:(530) 335-2364\" target=\"_blank\"><i class=\"fa fa-phone\" aria-hidden=\"true\"><\/i>(530) 335-2364<\/a><br><a href=\"https:\/\/www.seti.org\/ata\" target=\"_blank\"><i class=\"fa fa-link\" aria-hidden=\"true\"><\/i>SETI.org<\/a><br><\/div><div class=\"infos-listing__socials marg-v--base\"><a class=\"icon-facebook\" href=\"https:\/\/www.facebook.com\/SETIInstitute\" title=\"Facebook\" target=\"_blank\"><i class=\"fa fa-facebook\" aria-hidden=\"true\"><\/i><\/a><a class=\"icon-youtube\" href=\"https:\/\/www.youtube.com\/setiinstitute\" target=\"_blank\" title=\"Youtube\"><i class=\"fa fa-youtube-play\" aria-hidden=\"true\"><\/i><\/a><\/div><\/div>\r\n\t\t<\/div>\r\n\t\t<div class=\"clear\"><\/div>\n<p><iframe loading=\"lazy\" title=\"We are SETI Institute\" src=\"https:\/\/player.vimeo.com\/video\/740520693?dnt=1&amp;app_id=122963\" width=\"810\" height=\"344\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture; clipboard-write\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SETI qu\u2019il y a des aliens ou pas\u00a0? SETI, c\u2019est la Search of Extraterrestrial Intelligence, et donc\u00a0tous les moyens mis en \u0153uvre pour chercher (on a pas dit \u00ab\u00a0trouver\u00a0\u00bb) et d\u00e9tecter des signes de vie extraterrestre. Mis en place dans les ann\u00e9es 60, ce programme analyse les spectres \u00e9lectromagn\u00e9tiques qui se baladent dans l\u2019espace et [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":164263,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[193],"tags":[442,219,627,639,227],"class_list":["post-4739","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-insolite","tag-californie","tag-san-francisco","tag-sortie","tag-telescope","tag-visite"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The Allen Telescope Array en Californie - Les signes de vie extraterrestres<\/title>\n<meta name=\"description\" content=\"Au Allen Telescope Array, les scientifiques tachent justement de rep\u00e9rer les signes de vie extraterrestres qui pourraient nous parvenir. 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