{"id":881,"date":"2006-09-07T12:06:00","date_gmt":"2006-09-07T10:06:00","guid":{"rendered":"https:\/\/kids.esa.int\/supernovas\/"},"modified":"2026-10-08T00:33:19","modified_gmt":"2026-10-07T22:33:19","slug":"supernovas","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/supernovas\/","title":{"rendered":"Supernovaer"},"content":{"rendered":"
\n

Indimellem bliver vores M\u00e6lkevej oplyst af en k\u00e6mpe eksplosion. Denne voldsomme begivenhed, der kaldes en supernova, markerer en superk\u00e6mpestjernes d\u00f8d \u2013 en stjerne i den tunge v\u00e6gtklasse, der er mange gange st\u00f8rre end Solen. En af de seneste supernovaer i M\u00e6lkevejen fandt sted for omkring 340 \u00e5r siden i stjernebilledet Cassiopeia, og den er derfor kendt som Cassiopeia A (Cas A).<\/p>\n<\/div>\n

Cas A ligger 10.000 lys\u00e5r fra Jorden. Observatorier som NASA-ESA\u2019s Hubble-rumteleskop har foretaget detaljerede unders\u00f8gelser af den tilbagev\u00e6rende sky af gl\u00f8dende gas og st\u00f8v.<\/p>\n

\"Zooming
Zoom ind p\u00e5 Cassiopeia A<\/figcaption><\/figure>\n

Billederne viser en s\u00f8nderrevet ring af materiale, der bev\u00e6ger sig hurtigt v\u00e6k fra eksplosionsstedet. En del af materialet bev\u00e6ger sig med en hastighed p\u00e5 omkring 50 millioner km i timen (hurtigt nok til at tilbagel\u00e6gge afstanden fra Jorden til M\u00e5nen p\u00e5 30 sekunder!). De enorme hvirvler af vragdele lyser, fordi de er blevet opvarmet af chokb\u00f8lgen fra supernovaen, da den passerede forbi.<\/p>\n

Der findes flere typer supernovaeksplosioner. Cas A eksploderede, da en lille stjerne, en s\u00e5kaldt hvid dv\u00e6rg, sugede en stor m\u00e6ngde stof til sig fra en n\u00e6rliggende stjerne. Efterh\u00e5nden som gassen hobede sig op, blev den hvide dv\u00e6rg s\u00e5 varm og aktiv, at den eksploderede. Andre supernovaer opst\u00e5r, n\u00e5r massive stjerner l\u00f8ber t\u00f8r for br\u00e6ndstof i deres kerner. Da kernen ikke l\u00e6ngere kan afgive energi, kollapser den og \u00f8del\u00e6gger stjernen.<\/p>\n

Supernovaer er vigtige, fordi de spreder stjernemateriale ud over hele galaksen. N\u00e6sten alt p\u00e5 Jorden (inklusive os!) best\u00e5r af grundstoffer (som f.eks. kulstof og jern), der stammer fra dette stjernest\u00f8v.<\/p>","protected":false},"excerpt":{"rendered":"

Every now and again our Milky Way galaxy is lit up by a huge explosion. Known as a supernova, this violent event marks the death of a supergiant \u2013 a […]<\/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\/2006\/08\/hubble_s_view_of_supernova_explosion_cassiopeia_a2\/18245292-2-eng-GB\/Hubble_s_view_of_supernova_explosion_Cassiopeia_A.jpg","esa_banner_description":"Hubble\u2019s view of supernova explosion Cassiopeia A","esa_banner_credit":"NASA, ESA, and the Hubble Heritage (STScI\/AURA)-ESA\/Hubble Collaboration","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2006\/08\/Hubble_s_view_of_supernova_explosion_Cassiopeia_A2","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":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-881","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-stars-and-galaxies"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/881","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=881"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/881\/revisions"}],"predecessor-version":[{"id":4717,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/881\/revisions\/4717"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=881"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=881"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=881"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=881"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=881"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=881"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=881"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=881"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=881"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}