{"id":14055,"date":"2021-05-20T17:02:15","date_gmt":"2021-05-20T17:02:15","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=14055"},"modified":"2021-06-07T15:50:14","modified_gmt":"2021-06-07T15:50:14","slug":"les-diamants-de-la-nebuleuse-du-collier-ne-sont-pas-eternels","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/20\/les-diamants-de-la-nebuleuse-du-collier-ne-sont-pas-eternels\/","title":{"rendered":"Les diamants de la n\u00e9buleuse du Collier ne sont pas \u00e9ternels"},"content":{"rendered":"<p><strong>Les nuages de gaz qui brillent comme des diamants dans la n\u00e9buleuse du Collier sont \u00e9ph\u00e9m\u00e8res. Ils finiront par dispara\u00eetre.<\/strong><\/p>\n<h5>Suivez la Fl\u00e8che dans le Triangle :<\/h5>\n<p>Elle s&#8217;appelle PN G054.2-03.4, PN pour <em>Planetary Nebulae<\/em>. Cette n\u00e9buleuse plan\u00e9taire, la n\u00e9buleuse du Collier, se situe dans la Fl\u00e8che. La petite constellation en question est \u00e0 rechercher dans le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/07\/24\/en-video-partez-a-la-decouverte-du-triangle-dete\/\" target=\"_blank\" rel=\"noopener\">Triangle d&#8217;\u00e9t\u00e9<\/a>. La n\u00e9buleuse doit son nom \u00e0 un anneau d&#8217;environ 1\/2 ann\u00e9e-lumi\u00e8re de diam\u00e8tre parsem\u00e9 de \u00ab perles \u00bb de gaz lumineuses. Nous en d\u00e9couvrons la beaut\u00e9 gr\u00e2ce \u00e0 cette <a href=\"https:\/\/esahubble.org\/images\/potw2117a\/?\" target=\"_blank\" rel=\"noopener\">superbe image<\/a> r\u00e9alis\u00e9e \u00e0 l&#8217;aide de la cam\u00e9ra grand champ du t\u00e9lescope spatial Hubble. L&#8217;instrument vient d&#8217;ailleurs de f\u00eater <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/images-telescope-hubble-hubble-continue-nous-emerveiller-ce-portrait-etoiles-plus-brillantes-galaxie-86986\/\" target=\"_blank\" rel=\"noopener\">ses 31 ans<\/a> (il a \u00e9t\u00e9 mis en orbite le 24 avril 1990).<\/p>\n<figure id=\"attachment_14056\" aria-describedby=\"caption-attachment-14056\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/collier.jpg\" rel=\"lightbox[14055]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14056\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/collier-450x313.jpg\" alt=\"\" width=\"450\" height=\"313\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/collier-450x313.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/collier-1024x713.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/collier-768x535.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/collier.jpg 1301w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14056\" class=\"wp-caption-text\">La n\u00e9buleuse du Collier dans la constellation de la Fl\u00e8che. \u00a9 ESA\/Hubble &amp; NASA, K. Noll<\/figcaption><\/figure>\n<p>Comment s&#8217;est form\u00e9 ce collier de diamants aux proportions cosmiques ? L\u00e0 o\u00f9 vous ne voyez qu&#8217;un point lumineux au centre de la n\u00e9buleuse, deux astres se livrent \u00e0 une danse endiabl\u00e9e.<\/p>\n<h5>Sc\u00e8ne de cannibalisme stellaire :<\/h5>\n<p>Imaginez deux \u00e9toiles identiques au <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/21\/gregor-telescope-allemand-etudie-surface-soleil\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a> qui tournent l&#8217;une autour de l&#8217;autre. Il y a 10.000 ans, la plus vieille des deux a enfl\u00e9 jusqu&#8217;\u00e0 engloutir son infortun\u00e9 compagnon. Mais ce dernier ne s&#8217;en est pas laiss\u00e9 compter. Il a continu\u00e9 \u00e0 orbiter \u00e0 l&#8217;int\u00e9rieur de sa voisine en acc\u00e9l\u00e9rant jusqu&#8217;\u00e0 effectuer un tour en un peu plus d&#8217;une journ\u00e9e seulement ! \u00c0 une telle vitesse, la petite \u00e9toile a progressivement arrach\u00e9 des morceaux de l&#8217;enveloppe de sa gourmande compagne. Ces lambeaux ont fini par former un anneau de d\u00e9bris (la n\u00e9buleuse) contenant des poches de gaz chaud et brillant (les diamants).<\/p>\n<figure id=\"attachment_14057\" aria-describedby=\"caption-attachment-14057\" style=\"width: 327px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche.jpg\" rel=\"lightbox[14055]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14057\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche-327x450.jpg\" alt=\"\" width=\"327\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche-327x450.jpg 327w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche-743x1024.jpg 743w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/fleche.jpg 768w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/a><figcaption id=\"caption-attachment-14057\" class=\"wp-caption-text\">La n\u00e9buleuse du Collier se trouve dans la Fl\u00e8che, une constellation situ\u00e9e dans un coin du Triangle d&#8217;\u00e9t\u00e9. \u00a9 Stelvision<\/figcaption><\/figure>\n<p>Les n\u00e9buleuses plan\u00e9taires sont condamn\u00e9es \u00e0 dispara\u00eetre, leur gaz se diluant dans l&#8217;espace en quelques dizaines de milliers d&#8217;ann\u00e9es. La n\u00e9buleuse du Collier ne fera pas exception \u00e0 la r\u00e8gle et perdra un jour ses diamants.<\/p>\n<h5>En savoir plus :<\/h5>\n<p>Les n\u00e9buleuses plan\u00e9taires (<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-nebuleuse-planetaire-51\/\" target=\"_blank\" rel=\"noopener noreferrer\">NP<\/a>) portent un nom qui peut pr\u00eater \u00e0 confusion. On le doit uniquement \u00e0 leur aspect circulaire qui les faisait passer pour des plan\u00e8tes dans les t\u00e9lescopes imparfaits de nos a\u00efeux. Il s\u2019agit en r\u00e9alit\u00e9 d\u2019une enveloppe gazeuse \u00e9ject\u00e9e par des \u00e9toiles tr\u00e8s chaudes. Elles deviennent instables en fin de vie, lorsqu\u2019elles ont atteint le stade de naine blanche.<\/p>\n<figure id=\"attachment_12496\" aria-describedby=\"caption-attachment-12496\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix.jpg\" rel=\"lightbox[14055]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12496\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12496\" class=\"wp-caption-text\">Certaines n\u00e9buleuses plan\u00e9taires sont particuli\u00e8rement photog\u00e9niques. La n\u00e9buleuse de l&#8217;H\u00e9lice ressemble \u00e0 un \u0153il dans le cosmos. \u00a9 NASA\/JPL-Caltech\/K. Su (Univ. of Arizona)<\/figcaption><\/figure>\n<p>Les astronomes estiment que notre Galaxie pourrait compter 30.000 NP dont seulement 10% ont \u00e9t\u00e9 d\u00e9couvertes \u00e0 ce jour. Depuis une dizaine d\u2019ann\u00e9es, des astronomes amateurs confirm\u00e9s ont d\u00e9cid\u00e9 de traquer de nouvelles n\u00e9buleuses plan\u00e9taires qui auraient \u00e9chapp\u00e9 aux grands t\u00e9lescopes. Ils ont mis au point des protocoles de prises de vues tr\u00e8s \u00e9labor\u00e9s et ont r\u00e9alis\u00e9 ainsi plusieurs centaines de d\u00e9couvertes. On peut retrouver leur travail sur le site <a href=\"http:\/\/planetarynebulae.net\/\" target=\"_blank\" rel=\"noopener noreferrer\"><em>PlanetaryNebulae.net<\/em><\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/20\/moisson-de-nebuleuses-planetaires-pour-deux-amateurs\/\" target=\"_blank\" rel=\"noopener\">Moisson de n\u00e9buleuses plan\u00e9taires pour deux amateurs<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/24\/un-systeme-stellaire-triple-se-cache-dans-la-nebuleuse-du-crane\/\" target=\"_blank\" rel=\"noopener\">Un syst\u00e8me stellaire triple se cache dans la n\u00e9buleuse du Cr\u00e2ne<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/10\/lhistoire-de-la-nebuleuse-de-la-belle-au-bois-dormant-alias-egb-9\/\" target=\"_blank\" rel=\"noopener\">EGB9, la n\u00e9buleuse retrouv\u00e9e par des amateurs<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Les nuages de gaz qui brillent comme des diamants dans la n\u00e9buleuse du Collier sont \u00e9ph\u00e9m\u00e8res. Ils finiront par dispara\u00eetre. Suivez la Fl\u00e8che dans le Triangle : Elle s&#8217;appelle PN G054.2-03.4, PN pour Planetary Nebulae. Cette n\u00e9buleuse plan\u00e9taire, la n\u00e9buleuse du Collier, se situe dans la Fl\u00e8che. La petite constellation en question est \u00e0 rechercher &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/20\/les-diamants-de-la-nebuleuse-du-collier-ne-sont-pas-eternels\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Les diamants de la n\u00e9buleuse du Collier ne sont pas \u00e9ternels<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":14056,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3034,3033,3032],"class_list":["post-14055","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-la-fleche","tag-nebuleuse-du-collier","tag-pn-g054-2-03-4"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Les diamants de la n\u00e9buleuse du Collier ne sont pas \u00e9ternels<\/title>\n<meta name=\"description\" content=\"Les nuages de gaz qui brillent comme des diamants dans la n\u00e9buleuse du Collier sont \u00e9ph\u00e9m\u00e8res. 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