{"id":2187,"date":"2026-04-01T20:49:15","date_gmt":"2026-04-01T18:49:15","guid":{"rendered":"https:\/\/voyage-astrophoto.fr\/index.php\/messier\/m21\/"},"modified":"2026-04-01T20:49:15","modified_gmt":"2026-04-01T18:49:15","slug":"m21","status":"publish","type":"messier_object","link":"https:\/\/voyage-astrophoto.fr\/index.php\/messier\/m21\/","title":{"rendered":"M21 &#8211; Croix de Webb"},"content":{"rendered":"<p>\u00c0 4 250 ann\u00e9es-lumi\u00e8re, M21 compte environ 60 \u00e9toiles.[4, 6] Bien qu\\&rsquo;identifi\u00e9 s\u00e9par\u00e9ment par Messier, il partage le m\u00eame nuage mol\u00e9culaire g\u00e9ant que M20. Il repr\u00e9sente une \u00e9tape plus avanc\u00e9e de l\\&rsquo;\u00e9volution stellaire o\u00f9 la majeure partie du gaz environnant a \u00e9t\u00e9 dissip\u00e9e par le rayonnement des \u00e9toiles bleues massives.[10, 14]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-2187","messier_object","type-messier_object","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/messier_object\/2187","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=2187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}