{"id":978,"date":"2004-11-15T14:43:00","date_gmt":"2004-11-15T13:43:00","guid":{"rendered":"https:\/\/kids.esa.int\/star_death\/"},"modified":"2026-10-08T00:34:26","modified_gmt":"2026-10-07T22:34:26","slug":"star_death","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/star_death\/","title":{"rendered":"Stjerners d\u00f8d"},"content":{"rendered":"
\n

Det tar millioner av \u00e5r f\u00f8r de fleste stjerner d\u00f8r. N\u00e5r en stjerne som Solen har forbrent alt sitt hydrogen, utvider den seg og blir til en r\u00f8d kjempe. Denne kan ha en diameter p\u00e5 millioner av kilometer \u2013 stor nok til \u00e5 sluke planetene Merkur og Venus.<\/p>\n<\/div>\n

Etter \u00e5 ha bl\u00e5st bort de ytre lagene, kollapser stjernen og danner en sv\u00e6rt tett hvit dverg. En teskje med materiale fra en hvit dverg ville veie opptil 100 tonn. Over milliarder av \u00e5r avkj\u00f8les den hvite dvergen og blir usynlig.<\/p>\n

Stjerner som er tyngre enn \u00e5tte ganger solens masse, avslutter livet sitt sv\u00e6rt br\u00e5tt. N\u00e5r de g\u00e5r tom for brensel, svulmer de opp til r\u00f8de supergiganter. De pr\u00f8ver \u00e5 holde seg i live ved \u00e5 forbrenne andre typer brensel, men dette fungerer bare i noen f\u00e5 millioner \u00e5r. Deretter sprenges de i stykker i en enorm supernovaeksplosjon.<\/p>\n

I omtrent en uke skinner supernovaen sterkere enn alle de andre stjernene i galaksen sin. Deretter blekner den raskt. Det eneste som gjenst\u00e5r, er et bittelite, tett objekt \u2013 en n\u00f8ytronstjerne eller et svart hull \u2013 omgitt av en ekspanderende sky av sv\u00e6rt varm gass.<\/p>\n

Elementene som dannes inne i supergiganten (som oksygen, karbon og jern) spres ut i rommet. Dette stjernest\u00f8vet danner til slutt andre stjerner og planeter.<\/p>","protected":false},"excerpt":{"rendered":"

Most stars take millions of years to die. When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant. This may […]<\/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\/2003\/05\/ngc_6369_a_cosmic_ghost2\/17884213-2-eng-GB\/NGC_6369_a_cosmic_ghost.jpg","esa_banner_description":"NGC 6369, a cosmic ghost","esa_banner_credit":"NASA and The Hubble Heritage Team (STScI\/AURA)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/05\/NGC_6369_a_cosmic_ghost2","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-978","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\/nb\/wp-json\/wp\/v2\/posts\/978","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/comments?post=978"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/978\/revisions"}],"predecessor-version":[{"id":2121,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/978\/revisions\/2121"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=978"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=978"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=978"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=978"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=978"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=978"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=978"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}