{"id":56453,"date":"2023-12-24T15:18:32","date_gmt":"2023-12-24T15:18:32","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/naines-noires-celles-quon-ne-verra-jamais"},"modified":"2023-12-26T17:25:39","modified_gmt":"2023-12-26T17:25:39","slug":"naines-noires-celles-quon-ne-verra-jamais","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/naines-noires-celles-quon-ne-verra-jamais","title":{"rendered":"Naines noires, celles qu&rsquo;on ne verra jamais"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Tchad. <\/strong><\/span>Trop jeune. Malgre\u0301 ses 13,8 milliards d&rsquo;anne\u0301es, l&rsquo;Univers n&rsquo;a pas eu le temps de former une seule naine noire. Un reste stellaire qui est l&rsquo;e\u0301tape ultime (et the\u0301orique) de l&rsquo;e\u0301volution d&rsquo;une e\u0301toile peu massive comme le Soleil. Avant, elle sera passe\u0301e par le stade de ge\u0301ante rouge puis de naine blanche : un objet chaud d&rsquo;une tempe\u0301rature initiale pouvant atteindre 100.000 kelvins et dont la faible surface fait qu&rsquo;il va mettre tre\u0300s longtemps a\u0300 se refroidir. Probablement des dizaines de millions de milliards d&rsquo;anne\u0301es ! Voire beaucoup plus.<\/p>\n<p><b>Une sphe\u0300re noire quasi inde\u0301tectable<\/b><\/p>\n<p>L&rsquo;incertitude domine tant son e\u0301volution touche a\u0300 des questions fondamentales &#8211; tels la dure\u0301e de vie du proton ou les sce\u0301narios de fin de l&rsquo;Univers -, encore irre\u0301solues. Une fois froide, il ne restera plus qu&rsquo;une sphe\u0300re noire quasi inde\u0301tectable hormis par son influence gravitationnelle. Un tour de passe-passe quantique pourrait toutefois enclencher une nouvelle fusion engendrant une supernova noire, mais cela ne se produira pas avant 101100 anne\u0301es&#8230;<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/tchad\">Tchad<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Tchad. Trop jeune. Malgre\u0301 ses 13,8 milliards d&rsquo;anne\u0301es, l&rsquo;Univers n&rsquo;a pas eu le temps de former une seule naine noire. Un reste stellaire qui est l&rsquo;e\u0301tape ultime (et the\u0301orique) de l&rsquo;e\u0301volution d&rsquo;une e\u0301toile peu massive comme le Soleil. Avant, elle sera passe\u0301e par le stade de ge\u0301ante rouge puis de naine blanche : [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":56452,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37,292,29],"class_list":["post-56453","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-tchad"],"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>Naines noires, celles qu&#039;on ne verra jamais - tchad<\/title>\n<meta name=\"description\" content=\"Trop jeune. Malgre\u0301 ses 13,8 milliards d&#039;anne\u0301es, l&#039;Univers n&#039;a pas eu le temps de former une seule naine noire. 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