{"id":1284953,"date":"2023-08-19T14:30:09","date_gmt":"2023-08-19T12:30:09","guid":{"rendered":"https:\/\/www.tomsguide.fr\/?p=1284953"},"modified":"2023-08-19T14:59:56","modified_gmt":"2023-08-19T12:59:56","slug":"james-webb-le-telescope-spatial-decouvre-une-galaxie-extremement-ancienne-la-distance-qui-nous-separe-de-celle-ci-est-hallucinante","status":"publish","type":"post","link":"https:\/\/www.tomsguide.fr\/james-webb-le-telescope-spatial-decouvre-une-galaxie-extremement-ancienne-la-distance-qui-nous-separe-de-celle-ci-est-hallucinante\/","title":{"rendered":"James Webb : le t\u00e9lescope spatial d\u00e9couvre une galaxie situ\u00e9e \u00e0 des milliards d’ann\u00e9es-lumi\u00e8re de la Terre"},"content":{"rendered":"\n
\"Observations
Observations de la galaxie Maisie effectu\u00e9es par James Webb \u00a9 NASA<\/figcaption><\/figure>\n\n\n\n

Bien qu’ayant \u00e9t\u00e9 victime d’un impact de microm\u00e9t\u00e9orite<\/a>, le t\u00e9lescope spatial James Webb de la NASA scrute sans rel\u00e2che notre univers. Succ\u00e9dant au v\u00e9n\u00e9rable Hubble, l’engin est tr\u00e8s polyvalent<\/strong>. En effet, celui-ci est capable d’effectuer diff\u00e9rentes t\u00e2ches, qui vont de la d\u00e9tection de la vie sur des exoplan\u00e8tes<\/a> lointaines \u00e0 l’observation de l’espace profond. James Webb a ainsi pu fournir des images \u00e9poustouflantes de l’univers<\/a> et vient de d\u00e9couvrir une galaxie tr\u00e8s \u00e9loign\u00e9e.<\/strong><\/p>\n\n\n\n

L’un des principaux objectifs du t\u00e9lescope spatial James Webb (JWST) est d’utiliser sa puissance pour observer les premi\u00e8res galaxies de l’Univers<\/strong>. La plupart d’entre elles se sont form\u00e9es environ un milliard d’ann\u00e9es apr\u00e8s le Big Bang, co\u00efncidant avec la fin de “l’\u00e2ge sombre cosmique”. La lumi\u00e8re \u00e9mise par celles-ci met plusieurs milliards d’ann\u00e9es<\/strong> \u00e0 nous parvenir, nous permettant d’observer l’univers tel qu’il \u00e9tait \u00e0 cette p\u00e9riode.<\/p>\n\n\n\n

James Webb : la NASA remonte aux origines de l’Univers<\/h2>\n\n\n\n

James Webb a ainsi pu \u00e9tudier la galaxie de Maisie<\/strong>, qui semble avoir exist\u00e9 environ 390 millions d’ann\u00e9es apr\u00e8s le Big Bang<\/strong>. Celle-ci a \u00e9t\u00e9 d\u00e9couverte l’ann\u00e9e derni\u00e8re par la NASA. \u00c0 l’\u00e9poque, les observations ont plac\u00e9 cette galaxie \u00e0 une distance apparente d’environ 13,5 milliards d’ann\u00e9es-lumi\u00e8re<\/strong>. \u00c0 titre de comparaison, Proxima du Centaure, l’\u00e9toile la plus proche de notre syst\u00e8me solaire, est situ\u00e9e \u00e0 approximativement 4,22 ann\u00e9es-lumi\u00e8re de la Terre.<\/p>\n\n\n\n

Pendant de nombreuses ann\u00e9es, le record de la galaxie la plus \u00e9loign\u00e9e a \u00e9t\u00e9 d\u00e9tenu par Gz-11, d\u00e9couverte par Hubble en 2016. Puis, ce record a \u00e9t\u00e9 battu<\/strong> par EGS77, une galaxie qui existait lorsque l’Univers n’avait “que” 680 millions d’ann\u00e9es.<\/strong> Ainsi, bien qu’elle ne soit pas aussi jeune que les scientifiques le pensaient initialement, la galaxie de Maisie reste l’une des quatre galaxies les plus anciennes confirm\u00e9es.<\/strong><\/p>\n\n\n\n

La NASA confirme d’ailleurs ces r\u00e9sultats, en f\u00e9licitant son tr\u00e8s co\u00fbteux t\u00e9lescope spatial <\/a>: \u00ab  \u00ab Ce qui est passionnant avec la galaxie de Maisie, c’est qu’elle a \u00e9t\u00e9 l<\/em>‘une des premi\u00e8res galaxies lointaines identifi\u00e9es<\/em><\/strong> par le JWST et qu’elle est la premi\u00e8re \u00e0 avoir \u00e9t\u00e9 confirm\u00e9e par spectroscopie<\/em> \u00bb.<\/p>\n\n\n\n

Source : universetoday<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Pr\u00e8s de deux ans apr\u00e8s son lancement, l'immense t\u00e9lescope James Webb de la NASA n'en finit pas de nous surprendre. Cette fois, l'engin a pu observer une galaxie situ\u00e9e \u00e0 plusieurs milliards d'ann\u00e9es-lumi\u00e8re de la\u2026<\/p>","protected":false},"author":132,"featured_media":1284962,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[494],"tags":[3368],"hubs":[],"acf":{"display_mode":"medium-img","post_show_excerpt":true,"post_show_in_home":false,"post_show_summary":false,"post_source":"","hide_sidebar":false,"hide_advertising":false},"yoast_head":"\nJames Webb : le t\u00e9lescope spatial d\u00e9couvre une galaxie situ\u00e9e \u00e0 des milliards d'ann\u00e9es-lumi\u00e8re de la Terre<\/title>\n<meta name=\"description\" content=\"Pr\u00e8s de deux ans apr\u00e8s son lancement, l'immense t\u00e9lescope James Webb de la NASA n'en finit pas de nous surprendre. 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