{"id":2739,"date":"2026-05-28T19:23:08","date_gmt":"2026-05-28T17:23:08","guid":{"rendered":"http:\/\/localhost\/messier\/m25"},"modified":"2026-06-04T14:07:29","modified_gmt":"2026-06-04T12:07:29","slug":"m25-2","status":"publish","type":"messier_object","link":"https:\/\/voyage-astrophoto.fr\/index.php\/messier\/m25-2\/","title":{"rendered":"M25 &#8211; Amas Ouvert M25"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">M25 fut probablement mentionn\u00e9 pour la premi\u00e8re fois par Giovanni Battista Hodierna avant 1654, mais sa premi\u00e8re mention claire revient \u00e0 Charles Messier qui le d\u00e9couvrit ind\u00e9pendamment le 3 juin 1764. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cet amas ouvert contient environ 600 \u00e9toiles, dont une dizaine sont des g\u00e9antes brillantes visibles m\u00eame dans des instruments modestes. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il est particuli\u00e8rement notable pour abriter au moins six \u00e9toiles variables c\u00e9ph\u00e9ides classiques, qui constituent des chandelles standards pour mesurer les distances cosmiques. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M25 est situ\u00e9 \u00e0 environ 2 100 ann\u00e9es-lumi\u00e8re de la Terre et s&rsquo;\u00e9tend sur un diam\u00e8tre d&rsquo;environ 19 ann\u00e9es-lumi\u00e8re. Son \u00e2ge est estim\u00e9 entre 70 et 130 millions d&rsquo;ann\u00e9es. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Sources: SEDS Messier Database, Wikipedia, NASA.<\/em><\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-2739","messier_object","type-messier_object","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/messier_object\/2739","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/messier_object"}],"about":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/types\/messier_object"}],"wp:attachment":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/media?parent=2739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}