{"id":925,"date":"2004-11-15T14:00:00","date_gmt":"2004-11-15T13:00:00","guid":{"rendered":"https:\/\/kids.esa.int\/star_birth\/"},"modified":"2026-10-08T00:33:50","modified_gmt":"2026-10-07T22:33:50","slug":"star_birth","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/star_birth\/","title":{"rendered":"Stjerners tilblivelse"},"content":{"rendered":"
\n

Ligesom mennesker bliver stjerner f\u00f8dt, bliver de gamle og d\u00f8r. De opst\u00e5r i enorme, kolde skyer af gas og st\u00f8v, der kaldes \u2018t\u00e5ger\u2019. Den mest ber\u00f8mte af disse er Oriont\u00e5gen, som lige akkurat kan ses med det blotte \u00f8je.<\/p>\n<\/div>\n

Disse skyer begynder at krympe under deres egen tyngdekraft. Efterh\u00e5nden som skyen bliver mindre, opdeles den i klumper. Hver klump bliver til sidst s\u00e5 varm og t\u00e6t, at der opst\u00e5r kernereaktioner. N\u00e5r temperaturen n\u00e5r op p\u00e5 10 millioner grader Celsius, bliver klumpen til en ny stjerne.<\/p>\n

Efter deres f\u00f8dsel befinder de fleste unge stjerner sig i midten af en flad skive af gas og st\u00f8v. St\u00f8rstedelen af dette materiale bl\u00e6ses til sidst v\u00e6k af stjernens str\u00e5ling. Inden dette sker, kan der dannes planeter omkring den centrale stjerne.<\/p>\n

\"Star-forming
M\u00f8rk sky, hvor der dannes stjerner, fotograferet af ISO<\/figcaption><\/figure>\n

Infrar\u00f8de observatorier kan registrere varme fra usynlige stjerner, der er ved at dannes inde i s\u00e5danne skyer. Et af de mest kraftfulde af disse er ESA\u2019s rumobservatorium Herschel, der blev opsendt i maj 2009. Herschel vil i mindst tre \u00e5r unders\u00f8ge de st\u00f8vfyldte skyer, hvor stjerner \u2013 store som sm\u00e5 \u2013 bliver f\u00f8dt.<\/p>","protected":false},"excerpt":{"rendered":"

Like people, stars are born, they grow old and they die. Their birth places are huge, cold clouds of gas and dust, known as ‘nebulas’. The most famous of these […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2004\/01\/nearby_galaxy_ngc_1569_is_a_hotbed_of_star_birth_activity2\/17880180-2-eng-GB\/Nearby_galaxy_NGC_1569_is_a_hotbed_of_star_birth_activity.jpg","esa_banner_description":"Nearby galaxy NGC 1569 is a 'hotbed' of star birth activity","esa_banner_credit":"ESA, NASA and Peter Anders (G\u00f6ttingen University Galaxy Evolution Group, Germany)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/01\/Nearby_galaxy_NGC_1569_is_a_hotbed_of_star_birth_activity2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,11,21],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-925","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-stars-and-galaxies","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/925","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=925"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/925\/revisions"}],"predecessor-version":[{"id":4742,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/925\/revisions\/4742"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=925"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=925"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=925"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=925"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=925"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=925"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=925"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}