{"id":196,"date":"2021-12-02T12:44:26","date_gmt":"2021-12-02T11:44:26","guid":{"rendered":"https:\/\/kids.esa.int\/stars2\/"},"modified":"2026-10-08T00:25:22","modified_gmt":"2026-10-07T22:25:22","slug":"stars2","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/stars2\/","title":{"rendered":"Stjerner"},"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 kan ses med det blotte \u00f8je.<\/p>\n<\/div>\n

Milliarder af \u00e5r efter sin tilblivelse, n\u00e5r en mellemstor stjerne som Solen n\u00e6rmer sig slutningen af sit liv, udvider den sig og bliver til en r\u00f8d k\u00e6mpe. Den kan n\u00e5 en diameter p\u00e5 millioner af kilometer \u2013 n\u00e5r dette sker for Solen, vil den v\u00e6re stor nok til at sluge planeterne Merkur og Venus!<\/p>\n

Efter at have udst\u00f8dt sine ydre gaslag kollapser stjernen og danner en meget t\u00e6t hvid dv\u00e6rg. En teskefuld materiale fra en hvid dv\u00e6rg ville veje op til 100 ton! I l\u00f8bet af milliarder af \u00e5r afk\u00f8les den hvide dv\u00e6rg og bliver usynlig. Men bare rolig, det vil ikke ske for vores Sol f\u00f8r om cirka 5 milliarder \u00e5r!<\/p>\n

Sm\u00e5 stjerner lever i meget lang tid, mere end 10 milliarder \u00e5r. Deres d\u00f8d er aldrig blevet observeret, men man forventer, at de afslutter deres liv stille og roligt og til sidst langsomt slukker.<\/p>\n

\"Supernova
Supernova-rest<\/figcaption><\/figure>\n

De st\u00f8rste stjerner slutter deres liv meget pludseligt. Mod slutningen af deres liv svulmer de op til r\u00f8de superk\u00e6mper, inden de til sidst spr\u00e6nger sig selv i stykker i en k\u00e6mpe supernovaeksplosion.<\/p>\n

I cirka en uge lyser supernovaen st\u00e6rkere end alle de andre stjerner i sin galakse. Derefter svinder den hurtigt bort. Det eneste, der er tilbage, er et lille, t\u00e6t objekt \u2013 en neutronstjerne eller et sort hul \u2013 omgivet af en udvidende sky af meget varm gas.<\/p>\n

De grundstoffer, der dannes inde i supergiganten (s\u00e5som ilt, kulstof og jern), spredes ud i rummet. Dette stjernest\u00f8v danner til sidst andre stjerner og planeter!<\/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-196","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\/196","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=196"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/196\/revisions"}],"predecessor-version":[{"id":4352,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/196\/revisions\/4352"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=196"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=196"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=196"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=196"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=196"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=196"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=196"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=196"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=196"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}