{"id":66272,"date":"2025-03-29T12:00:00","date_gmt":"2025-03-29T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue"},"modified":"2025-03-29T12:00:00","modified_gmt":"2025-03-29T12:00:00","slug":"decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue","title":{"rendered":"D\u00e9couverte D\u2019oxyg\u00e8ne dans la Plus Lointaine Galaxie Connue"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>La plus lointaine galaxie connue contient des traces d\u2019oxyge\u0300ne, une de\u0301couverte confortant l\u2019ide\u0301e que ces amas d\u2019e\u0301toiles qui peuplent aujourd\u2019hui le cosmos se sont forme\u0301s tre\u0300s rapidement dans les premiers a\u0302ges de l\u2019Univers.<\/p>\n<p>De\u0301couverte l\u2019an dernier par le te\u0301lescope spatial James Webb, JADES-GS-z14-0 est si lointaine que sa lumie\u0300re a mis 13,4 milliards d\u2019anne\u0301es a\u0300 nous parvenir. Une distance record qui la re\u0301ve\u0300le telle qu\u2019elle e\u0301tait quand l\u2019Univers, vieux aujourd\u2019hui de 13,8 milliards d\u2019anne\u0301e, en avait moins de 300 millions.<\/p>\n<p>Elle est aussi remarquablement lumineuse, signe d\u2019une intense activite\u0301 stellaire a\u0300 une e\u0301poque ou\u0300 la the\u0301orie et les observations pre\u0301disaient qu\u2019elle devrait e\u0302tre beaucoup plus faible.<\/p>\n<p>De\u0300s son entre\u0301e en ope\u0301ration en 2022, le te\u0301lescope James Webb avait re\u0301ve\u0301le\u0301 l\u2019apparition plus pre\u0301coce qu\u2019envisage\u0301 de galaxies plus lumineuses qu\u2019attendu.<\/p>\n<p>Deux e\u0301quipes internationales, ne\u0301erlandaise et italienne, confirment ce sce\u0301nario avec des observations effectue\u0301es a\u0300 l\u2019aide du radiote\u0301lescospe ALMA de l\u2019Observatoire europe\u0301en austral (ESO), au Chili.<\/p>\n<p>Leur de\u0301tection confirme\u0301e de traces d\u2019oxyge\u0300ne dans JADES-GS-z14-0, qui e\u0301tait simplement suspecte\u0301e avec le James Webb, est surprenante. Car les premie\u0300res galaxies apparues a\u0300 l\u2019e\u0301poque de ce que l\u2019on appelle l\u2019aube cosmique sont re\u0301pute\u0301es pauvres en e\u0301le\u0301ments lourds tels que l\u2019oxyge\u0300ne.<\/p>\n<p>\u00ab C\u2019est comme trouver un adolescent la\u0300 ou\u0300 on ne s\u2019attendrait qu\u2019a\u0300 voir des be\u0301be\u0301s \u00bb, a dit Sander Schouws, doctorant a\u0300 l\u2019Observatoire ne\u0301erlandais de Leiden et premier auteur d\u2019une e\u0301tude a\u0300 parai\u0302tre dans The Astrophysical Journal, cite\u0301 par l\u2019ESO.<\/p>\n<p>Une me\u0301taphore illustrant le fait que les premie\u0300res e\u0301toiles d\u2019une jeune galaxie fonctionnent avec des e\u0301le\u0301ments le\u0301gers, l\u2019hydroge\u0300ne et l\u2019he\u0301lium, et que c\u2019est seulement apre\u0300s une lente e\u0301volution que leur galaxie s\u2019enrichit en e\u0301le\u0301ments lourds.<\/p>\n<p>Les re\u0301sultats montrent que JADES-GS-z14-0 \u00ab s\u2019est forme\u0301e tre\u0300s rapidement et e\u0301volue tout aussi vite, renforc\u0327ant un nombre croissant d\u2019indices sugge\u0301rant que la formation des galaxies se de\u0301roule bien plus rapidement que ce que l\u2019on pensait \u00bb, a encore dit M. Schouws.<\/p>\n<p>Les deux e\u0301tudes indiquent que cette galaxie contient environ dix fois plus d\u2019e\u0301le\u0301ments lourds que pre\u0301vu, selon le communique\u0301 de l\u2019ESO.<\/p>\n<p>\u00ab La preuve qu\u2019une galaxie est de\u0301ja\u0300 mature dans l\u2019Univers naissant soule\u0300ve des questions sur le moment et la manie\u0300re \u00bb dont elles se sont forme\u0301es, a dit Stefano Carniani, de la Scuola normale superiore de Pise et auteur de la deuxie\u0300me e\u0301tude, qui doit parai\u0302tre dans Astronomy &amp; Astrophysics.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<span style=\"color: #ff6600\"><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. La plus lointaine galaxie connue contient des traces d\u2019oxyge\u0300ne, une de\u0301couverte confortant l\u2019ide\u0301e que ces amas d\u2019e\u0301toiles qui peuplent aujourd\u2019hui le cosmos se sont forme\u0301s tre\u0300s rapidement dans les premiers a\u0302ges de l\u2019Univers. De\u0301couverte l\u2019an dernier par le te\u0301lescope spatial James Webb, JADES-GS-z14-0 est si lointaine que sa lumie\u0300re a mis 13,4 [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":66271,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-66272","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"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>D\u00e9couverte D\u2019oxyg\u00e8ne dans la Plus Lointaine Galaxie Connue - Senegal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9couverte D\u2019oxyg\u00e8ne dans la Plus Lointaine Galaxie Connue\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; Senegal. La plus lointaine galaxie connue contient des traces d\u2019oxyge\u0300ne, une de\u0301couverte confortant l\u2019ide\u0301e que ces amas d\u2019e\u0301toiles qui peuplent aujourd\u2019hui le cosmos se sont forme\u0301s tre\u0300s rapidement dans les premiers a\u0302ges de l\u2019Univers. De\u0301couverte l\u2019an dernier par le te\u0301lescope spatial James Webb, JADES-GS-z14-0 est si lointaine que sa lumie\u0300re a mis 13,4 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2025-03-29T12:00:00+00:00\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"D\u00e9couverte D\u2019oxyg\u00e8ne dans la Plus Lointaine Galaxie Connue\",\"datePublished\":\"2025-03-29T12:00:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue\"},\"wordCount\":521,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/03\/sm_1743280481.695413.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-doxygene-dans-la-plus-lointaine-galaxie-connue\",\"name\":\"D\u00e9couverte D\u2019oxyg\u00e8ne dans la Plus Lointaine Galaxie Connue - 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