{"id":37187,"date":"2023-08-10T18:19:45","date_gmt":"2023-08-10T18:19:45","guid":{"rendered":"https:\/\/www.africa-press.net\/mali\/politique\/le-james-webb-sublime-la-nebuleuse-de-la-lyre"},"modified":"2023-08-10T18:19:45","modified_gmt":"2023-08-10T18:19:45","slug":"le-james-webb-sublime-la-nebuleuse-de-la-lyre","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/mali\/divers\/le-james-webb-sublime-la-nebuleuse-de-la-lyre","title":{"rendered":"Le James Webb sublime la n\u00e9buleuse de la Lyre"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Mali. <\/strong><\/span>Les ne\u0301buleuses plane\u0301taires \u2013 qui n\u2019ont rien a\u0300 voir avec les plane\u0300tes : elles portent ce nom pour des raisons historiques \u2013 correspondent au stade final de la vie des e\u0301toiles peu massives (moins de huit fois la masse de notre soleil). L\u2019astre s\u2019effondre sur lui-me\u0302me pour former une naine blanche en e\u0301jectant une coquille de gaz dans l\u2019espace qui peut former un anneau, une bulle ou d\u2019autres formes encore plus e\u0301tranges selon des me\u0301canismes qui ne sont pas clairement identifie\u0301s. Ces gaz, compose\u0301s de diffe\u0301rents e\u0301le\u0301ments chimiques, sont illumine\u0301s par la lumie\u0300re de l\u2019e\u0301toile centrale, et comme les feux d\u2019artifice e\u0301mettent des lueurs de diffe\u0301rentes couleurs.<\/p>\n<p><b>Premier aperc\u0327u<\/b><\/p>\n<p>La ne\u0301buleuse de la Lyre, situe\u0301e dans la constellation du me\u0302me nom a\u0300 2600 anne\u0301es-lumie\u0300re de la Terre, peut e\u0302tre observe\u0301e, dans de bonnes conditions, en e\u0301te\u0301 dans l\u2019he\u0301misphe\u0300re Nord sur une des branches du Triangle d\u2019e\u0301te\u0301 qui se compose de trois e\u0301toiles brillantes (Altai\u0308r, Deneb et Ve\u0301ga).<\/p>\n<p>C\u2019est une structure tre\u0300s jeune qui s\u2019est forme\u0301e il y a moins de 8000 ans et qui a e\u0301te\u0301 identifie\u0301e pour la premie\u0300re fois par l\u2019astronome franc\u0327ais Charles Messier en 1779. Cette nouvelle vue est offerte par la came\u0301ra NIRcam du James Webb qui fonctionne dans le proche-infrarouge. Trois cliche\u0301s avec trois diffe\u0301rentes longueurs d\u2019onde composent cette image prise par le te\u0301lescope le 4 aou\u0302t 2023.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/mali\">Mali<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Mali. Les ne\u0301buleuses plane\u0301taires \u2013 qui n\u2019ont rien a\u0300 voir avec les plane\u0300tes : elles portent ce nom pour des raisons historiques \u2013 correspondent au stade final de la vie des e\u0301toiles peu massives (moins de huit fois la masse de notre soleil). L\u2019astre s\u2019effondre sur lui-me\u0302me pour former une naine blanche en [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":37186,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,17],"tags":[76,86,19],"class_list":["post-37187","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-mali","tag-mali"],"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 James Webb sublime la n\u00e9buleuse de la Lyre - Mali<\/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\/mali\/politique\/le-james-webb-sublime-la-nebuleuse-de-la-lyre\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le James Webb sublime la n\u00e9buleuse de la Lyre\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; Mali. Les ne\u0301buleuses plane\u0301taires \u2013 qui n\u2019ont rien a\u0300 voir avec les plane\u0300tes : elles portent ce nom pour des raisons historiques \u2013 correspondent au stade final de la vie des e\u0301toiles peu massives (moins de huit fois la masse de notre soleil). 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