{"id":12489,"date":"2020-11-16T18:11:54","date_gmt":"2020-11-16T18:11:54","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=12489"},"modified":"2020-11-24T18:59:49","modified_gmt":"2020-11-24T18:59:49","slug":"la-galaxie-ngc-6946-nous-offre-un-tourbillon-stellaire","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/16\/la-galaxie-ngc-6946-nous-offre-un-tourbillon-stellaire\/","title":{"rendered":"La galaxie NGC 6946 nous offre un tourbillon stellaire"},"content":{"rendered":"<p><strong>Rares sont les galaxies spirales que nous voyons exactement de face. Dans la constellation de C\u00e9ph\u00e9e NGC 6946 nous offre un spectacle d&#8217;une \u00e9tonnante beaut\u00e9.<\/strong><\/p>\n<h5>Un joyau tourbillonnant :<\/h5>\n<p>On l&#8217;appelle la galaxie du feu d&#8217;artifice et ce n&#8217;est pas par hasard. NGC 6946 est une galaxie spirale d\u00e9couverte par l&#8217;astronome germano-britannique <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/12\/telescope-william-herschel\/\" target=\"_blank\" rel=\"noopener noreferrer\">William Herschel<\/a> en 1798. Elle est inscrite\u00a0au\u00a0<em>New General Catalog Objects. <\/em>Ce dernier r\u00e9pertorie plusieurs milliers d\u2019objets c\u00e9lestes, beaucoup plus que le <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-astronomie-catalogue-messier-250-ans-16597\/\" target=\"_blank\" rel=\"noopener noreferrer\">catalogue Messier<\/a>.<\/p>\n<figure id=\"attachment_12490\" aria-describedby=\"caption-attachment-12490\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/galaxie.jpg\" rel=\"lightbox[12489]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12490\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/galaxie-450x342.jpg\" alt=\"\" width=\"450\" height=\"342\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/galaxie-450x342.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/galaxie-1024x777.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/galaxie-768x583.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/galaxie.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12490\" class=\"wp-caption-text\">La galaxie NGC 6946 nous offre un feu d&#8217;artifice stellaire. \u00a9 Robert Gendler<\/figcaption><\/figure>\n<p>Pour d\u00e9couvrir NGC 6946 il faut diriger son t\u00e9lescope vers la constellation de C\u00e9ph\u00e9e, non loin de l&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/31\/astuce-comment-reperer-la-celebre-etoile-polaire\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u00e9toile polaire<\/a>. La galaxie (de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener noreferrer\">magnitude<\/a> 9,6) se trouve \u00e0 10 millions d&#8217;ann\u00e9es-lumi\u00e8re.<!--more--><\/p>\n<h5>Une petite maison c\u00e9l\u00e8bre :<\/h5>\n<p>Les principales \u00e9toiles de C\u00e9ph\u00e9e \u00e9voquent une petite maison dessin\u00e9e maladroitement. La constellation est devenue c\u00e9l\u00e8bre un peu avant la d\u00e9couverte de la galaxie NGC 6946. En 1784 l&#8217;astronome amateur John Goodricke d\u00e9couvrit la variabilit\u00e9 d&#8217;un astre qui pulsait, l&#8217;\u00e9toile Delta Cephei. Cette derni\u00e8re a depuis donn\u00e9 son nom aux <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/univers-cepheides-mieux-mesurer-expansion-univers-10684\/\" target=\"_blank\" rel=\"noopener noreferrer\">c\u00e9ph\u00e9ides<\/a>. Ces chandelles cosmiques ont permis \u00e0 <a href=\"https:\/\/www.futura-sciences.com\/sciences\/personnalites\/astronomie-edwin-hubble-715\/\" target=\"_blank\" rel=\"noopener noreferrer\">Edwin Hubble<\/a> de mesurer la distance des galaxies et de d\u00e9couvrir <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/cosmologie-energie-noire-acceleration-expansion-univers-defie-encore-cosmologie-62378\/\" target=\"_blank\" rel=\"noopener noreferrer\">l&#8217;expansion de l&#8217;Univers<\/a>.<\/p>\n<figure id=\"attachment_5753\" aria-describedby=\"caption-attachment-5753\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/dragon.jpg\" rel=\"lightbox[12489]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-5753\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/dragon-450x299.jpg\" alt=\"\" width=\"450\" height=\"299\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/dragon-450x299.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/dragon-768x510.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/dragon-1024x681.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/dragon.jpg 1354w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-5753\" class=\"wp-caption-text\">La constellation de C\u00e9ph\u00e9e se situe non loin de l&#8217;\u00e9toile polaire. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<h5>Couleurs indispensables :<\/h5>\n<p>NGC 6946 se cache derri\u00e8re le rideau d&#8217;\u00e9toiles form\u00e9 par la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/08\/26\/en-video-quest-ce-que-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener noreferrer\">Voie lact\u00e9e<\/a> qui traverse cette constellation. Les photographies donnent des couleurs \u00e0 cette superbe galaxie spirale. Son bulbe central orang\u00e9 est compos\u00e9 de vieilles \u00e9toiles alors que le bleu de jeunes amas stellaires domine dans les bras spiraux. Le rouge r\u00e9v\u00e8le la pr\u00e9sence de zones o\u00f9 naissent les \u00e9toiles.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/05\/08\/une-supernova-explose-dans-la-galaxie-spirale-messier-61\/\" target=\"_blank\" rel=\"noopener noreferrer\">Une supernova explose dans la galaxie spirale Messier 61<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/23\/zoom-sur-ngc-986-une-superbe-galaxie-spirale-barree\/\" target=\"_blank\" rel=\"noopener noreferrer\">Zoom sur NGC 986, une superbe galaxie spirale barr\u00e9e<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/11\/14\/eso-137-001-la-galaxie-qui-perd-son-gaz-et-sa-poussiere\/\" target=\"_blank\" rel=\"noopener noreferrer\">ESO 137-001, la galaxie qui perd son gaz et sa poussi\u00e8re<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique 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>Rares sont les galaxies spirales que nous voyons exactement de face. Dans la constellation de C\u00e9ph\u00e9e NGC 6946 nous offre un spectacle d&#8217;une \u00e9tonnante beaut\u00e9. Un joyau tourbillonnant : On l&#8217;appelle la galaxie du feu d&#8217;artifice et ce n&#8217;est pas par hasard. NGC 6946 est une galaxie spirale d\u00e9couverte par l&#8217;astronome germano-britannique William Herschel en &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/16\/la-galaxie-ngc-6946-nous-offre-un-tourbillon-stellaire\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La galaxie NGC 6946 nous offre un tourbillon stellaire<\/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":12490,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[2914,2915],"class_list":["post-12489","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-cephee","tag-ngc-6946"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La galaxie NGC 6946 nous offre un tourbillon stellaire<\/title>\n<meta name=\"description\" content=\"Rares sont les galaxies spirales que nous voyons exactement de face. 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