{"id":12602,"date":"2024-03-22T12:17:52","date_gmt":"2024-03-22T12:17:52","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/le-telescope-gaia-deniche-des-fragments-de-la-voie-lactee-archaique"},"modified":"2024-03-23T05:33:03","modified_gmt":"2024-03-23T05:33:03","slug":"le-telescope-gaia-deniche-des-fragments-de-la-voie-lactee-archaique","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/le-telescope-gaia-deniche-des-fragments-de-la-voie-lactee-archaique","title":{"rendered":"Le t\u00e9lescope Gaia d\u00e9niche des fragments de la Voie lact\u00e9e archa\u00efque"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Le te\u0301lescope spatial Gaia, de\u0301die\u0301 a\u0300 la cartographie de la Voie lacte\u0301e, a identifie\u0301 deux groupes d\u2019e\u0301toiles primitives au coeur de notre galaxie, qui seraient a\u0300 l\u2019origine de sa formation il y a plus de 12 milliards d\u2019anne\u0301es, selon une e\u0301tude parue jeudi.<\/p>\n<p>Ces deux \u201ccourants d\u2019e\u0301toiles\u201d au mouvement de rotation ordonne\u0301e, contenant chacun la masse de 10 millions de soleils, s\u2019apparentent aux \u201cpremiers blocs de construction\u201d de l\u2019ancien coeur de la Voie lacte\u0301e, la\u0300 ou\u0300 les premie\u0300res e\u0301toiles virent le jour avant que la galaxie grossisse et prenne sa forme actuelle de spirale, dit a\u0300 l\u2019AFP Khyati Malhan de l\u2019Institut Max Planck d\u2019astrophysique en Allemagne.<\/p>\n<p>\u201cC\u2019est la premie\u0300re fois qu\u2019on arrive a\u0300 identifier des fragments de cette protogalaxie\u201d, baptise\u0301s Shakti et Shiva, du nom des dieux hindous \u201cdont l\u2019union donna naissance au cosmos\u201d, de\u0301taille l\u2019auteur principal de l\u2019e\u0301tude publie\u0301e dans The Astrophysical Journal.<\/p>\n<p>La sonde Gaia de l\u2019ESA (agence spatiale europe\u0301enne), qui ope\u0300re a\u0300 1,5 million de kilome\u0300tres de la Terre depuis 10 ans, a livre\u0301 en 2022 une carte en 3D des positions et des mouvements de plus d\u20191,8 milliard d\u2019e\u0301toiles.<\/p>\n<p>Cette carte avait permis d\u2019identifier une population d\u2019e\u0301toiles surnomme\u0301e \u201cpauvre vieux coeur\u201d, en raison de leur vieillesse \u2013 lie\u0301e a\u0300 une faible me\u0301tallicite\u0301 (un indicateur chimique de l\u2019a\u0302ge d\u2019une e\u0301toile) \u2013 et de leur emplacement central.<\/p>\n<p>C\u2019e\u0301tait une e\u0301tape importante pour l\u2019arche\u0301ologie galactique, qui vise a\u0300 reconstituer les diffe\u0301rentes e\u0301poques de l\u2019histoire de la Voie lacte\u0301e \u201cde la me\u0302me manie\u0300re que les arche\u0301ologues reconstruiraient l\u2019histoire d\u2019une ville\u201d, explique l\u2019Institut Max Planck dans un communique\u0301.<\/p>\n<p>Le mode\u0300le de l\u2019e\u0301volution de la Voie lacte\u0301e suppose ainsi \u201cune vieille ville centrale entoure\u0301e de quartiers plus re\u0301cents\u201d, selon l\u2019institut.<\/p>\n<p>Mais \u201cplus on recule dans le temps et l\u2019espace, plus le tableau de l\u2019histoire galactique se floute\u201d, souligne Khyati Malhan.<\/p>\n<p>Les astronomes ont donc enque\u0302te\u0301 sur ce coeur archai\u0308que identifie\u0301 en 2022. Ils y ont pris un e\u0301chantillon de 6 millions d\u2019e\u0301toiles, e\u0301tudie\u0301 leur chimie et leur position en faisant notamment appel a\u0300 l\u2019intelligence artificielle.<\/p>\n<p>Et ont ainsi mis le doigt sur deux \u201ccourants stellaires\u201d, Shakti et Shiva, forme\u0301s il y a entre 12 et 13 milliards d\u2019anne\u0301es, aux premiers a\u0302ges de la Voie lacte\u0301e.<\/p>\n<p>Surprise, leurs e\u0301toiles ont une me\u0301tallicite\u0301 anormalement e\u0301leve\u0301e pour un si grand a\u0302ge. C\u2019est le signe probable qu\u2019elles sont issues d\u2019une ge\u0301ne\u0301ration ante\u0301rieure d\u2019e\u0301toiles. En mourant, ces dernie\u0300res ont libe\u0301re\u0301 les e\u0301le\u0301ments chimiques qui ont \u201censemence\u0301\u201d le gaz interstellaire dont sont issues les e\u0301toiles de Shakti et Shiva.<\/p>\n<p>\u201cFaire la lumie\u0300re sur l\u2019enfance de notre galaxie est l\u2019une des missions de Gaia, et elle est en train d\u2019y parvenir\u201d, se fe\u0301licite Timo Prusti, responsable scientifique du projet a\u0300 l\u2019ESA. Me\u0302me s\u2019il sera difficile de \u201ctrouver l\u2019embryon\u201d originel de la Voie lacte\u0301e, ajoute Khyati Malhan.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/sao-tome-e-principe\">S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. Le te\u0301lescope spatial Gaia, de\u0301die\u0301 a\u0300 la cartographie de la Voie lacte\u0301e, a identifie\u0301 deux groupes d\u2019e\u0301toiles primitives au coeur de notre galaxie, qui seraient a\u0300 l\u2019origine de sa formation il y a plus de 12 milliards d\u2019anne\u0301es, selon une e\u0301tude parue jeudi. Ces deux \u201ccourants d\u2019e\u0301toiles\u201d au mouvement [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":12601,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-12602","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"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 Gaia d\u00e9niche des fragments de la Voie lact\u00e9e archa\u00efque - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"Le te\u0301lescope spatial Gaia, de\u0301die\u0301 a\u0300 la cartographie de la Voie lacte\u0301e, a 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