{"id":7562,"date":"2022-08-03T12:00:00","date_gmt":"2022-08-03T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/gabon\/politique\/le-telescope-james-webb-revele-une-spectaculaire-image-de-la-galaxie-de-la-roue-de-chariot"},"modified":"2022-08-03T19:51:33","modified_gmt":"2022-08-03T19:51:33","slug":"le-telescope-james-webb-revele-une-spectaculaire-image-de-la-galaxie-de-la-roue-de-chariot","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/gabon\/toutes-les-actualites\/le-telescope-james-webb-revele-une-spectaculaire-image-de-la-galaxie-de-la-roue-de-chariot","title":{"rendered":"Le t\u00e9lescope James-Webb r\u00e9v\u00e8le une spectaculaire image de la galaxie de la Roue de chariot"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Gabon. <\/strong><\/span>Cette galaxie avait d\u00e9j\u00e0 \u00e9t\u00e9 observ\u00e9e par le t\u00e9lescope spatial Hubble, mais les capacit\u00e9s infrarouges de James-Webb r\u00e9v\u00e8lent de nouveaux d\u00e9tails jusqu\u2019ici cach\u00e9s, en permettant de voir \u00e0 travers une grande quantit\u00e9 de poussi\u00e8re.<\/p>\n<p>La NASA a publi\u00e9 mardi 2 ao\u00fbt une rare et superbe image d\u2019une galaxie \u00e9loign\u00e9e de 500 millions d\u2019ann\u00e9es-lumi\u00e8re, la galaxie de la Roue de chariot, dont les anneaux apparaissent avec une clart\u00e9 jusqu\u2019ici in\u00e9gal\u00e9e gr\u00e2ce au flambant neuf t\u00e9lescope spatial James-Webb.<\/p>\n<p>Tout comme notre Voie lact\u00e9e, les astronomes pensent que la galaxie de la Roue de chariot \u00e9tait par le pass\u00e9 une galaxie spirale. Mais un \u00e9v\u00e9nement spectaculaire lui a donn\u00e9 sa forme : la collision avec une autre galaxie plus petite (non visible sur l\u2019image). Deux anneaux se sont alors form\u00e9s depuis le centre de la collision, similaires aux ondulations en cercles concentriques provoqu\u00e9es par un caillou jet\u00e9 dans l\u2019eau. C\u2019est ce qui lui a valu son nom \u00e9vocateur.<\/p>\n<p>Le premier anneau, plus au centre, est tr\u00e8s brillant, et le second, \u00e0 l\u2019ext\u00e9rieur, est en expansion depuis 440 millions d\u2019ann\u00e9es. Durant son expansion, l\u2019anneau percute le gaz alentour, d\u00e9clenchant la formation d\u2019\u00e9toiles.<\/p>\n<p>La galaxie de la Roue de chariot est toujours dans un \u00e9tat \u00ab transitoire \u00bb, a soulign\u00e9 la NASA dans son communiqu\u00e9. Si le t\u00e9lescope James-Webb \u00ab nous fournit un aper\u00e7u de [son] \u00e9tat actuel, il nous donne aussi une id\u00e9e de ce qui lui est arriv\u00e9 par le pass\u00e9, et de comment elle \u00e9voluera \u00e0 l\u2019avenir \u00bb.<\/p>\n<p>Bijou d\u2019ing\u00e9nierie<\/p>\n<p>Cette galaxie avait d\u00e9j\u00e0 \u00e9t\u00e9 observ\u00e9e par le t\u00e9lescope spatial Hubble, mais les capacit\u00e9s infrarouges de James-Webb r\u00e9v\u00e8lent de nouveaux d\u00e9tails jusqu\u2019ici cach\u00e9s, en permettant de voir \u00e0 travers une grande quantit\u00e9 de poussi\u00e8re. L\u2019image composite, issue des observations de deux instruments scientifiques du t\u00e9lescope, comporte \u00e9galement deux autres galaxies plus petites, ainsi que de nombreuses autres en arri\u00e8re-plan.<\/p>\n<p>Bijou d\u2019ing\u00e9nierie d\u2019une valeur de 10 milliards de dollars, le t\u00e9lescope James-Webb a \u00e9t\u00e9 lanc\u00e9 depuis Kourou, en Guyane fran\u00e7aise, en d\u00e9cembre dernier. Il se trouve d\u00e9sormais \u00e0 1,5 million de kilom\u00e8tres de la Terre.<\/p>\n<p>Nomm\u00e9 en l\u2019honneur de James Edwin Webb, le deuxi\u00e8me administrateur de la NASA (1961-1968), ce t\u00e9lescope est environ cent fois plus sensible que son pr\u00e9d\u00e9cesseur Hubble. Imagin\u00e9 par la NASA d\u00e8s le lancement de Hubble en 1990 et construit \u00e0 partir de 2004, avec la collaboration des agences spatiales europ\u00e9enne (ESA) et canadienne (CSA), le t\u00e9lescope James-Webb est \u00e9quip\u00e9 d\u2019un miroir de 6,5 m\u00e8tres d\u2019envergure, qui lui procure une surface et donc une sensibilit\u00e9 sept fois plus grande que son pr\u00e9d\u00e9cesseur. Une taille suffisante pour d\u00e9tecter la signature thermique d\u2019un bourdon sur la Lune.<\/p>\n<p>Autre diff\u00e9rence avec son pr\u00e9d\u00e9cesseur : son mode d\u2019observation. L\u00e0 o\u00f9 Hubble observe l\u2019espace essentiellement dans le domaine de la lumi\u00e8re visible, James-Webb s\u2019aventure dans une longueur d\u2019onde \u00e9chappant \u00e0 l\u2019\u0153il : l\u2019infrarouge proche et moyen. Un rayonnement que tout corps, astre, humain ou fleur \u00e9met naturellement.<\/p>\n<p>Sa pr\u00e9cision permettra de mieux comprendre la formation des \u00e9toiles et des galaxies et d\u2019observer les exoplan\u00e8tes, dont les astronomes d\u00e9couvrent toujours plus de sp\u00e9cimens, pour tenter d\u2019identifier, peut-\u00eatre un jour, d\u2019autres plan\u00e8tes abritant la vie.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/gabon\">Gabon<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Gabon. Cette galaxie avait d\u00e9j\u00e0 \u00e9t\u00e9 observ\u00e9e par le t\u00e9lescope spatial Hubble, mais les capacit\u00e9s infrarouges de James-Webb r\u00e9v\u00e8lent de nouveaux d\u00e9tails jusqu\u2019ici cach\u00e9s, en permettant de voir \u00e0 travers une grande quantit\u00e9 de poussi\u00e8re. La NASA a publi\u00e9 mardi 2 ao\u00fbt une rare et superbe image d\u2019une galaxie \u00e9loign\u00e9e de 500 millions [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":7561,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[36,50,49],"class_list":["post-7562","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-gabon","tag-gabon"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Le t\u00e9lescope James-Webb r\u00e9v\u00e8le une spectaculaire image de la galaxie de la Roue de chariot - Gabon<\/title>\n<meta name=\"description\" content=\"Cette galaxie avait d\u00e9j\u00e0 \u00e9t\u00e9 observ\u00e9e par 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