{"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\/sv\/supernovas\/","title":{"rendered":"Supernovor"},"content":{"rendered":"
\n

D\u00e5 och d\u00e5 lyser v\u00e5r galax, Vintergatan, upp av en enorm explosion. Denna v\u00e5ldsamma h\u00e4ndelse, som kallas en supernova, markerar d\u00f6den f\u00f6r en superj\u00e4tte \u2013 en j\u00e4ttestor stj\u00e4rna som \u00e4r m\u00e5nga g\u00e5nger st\u00f6rre \u00e4n Solen. En av de senaste supernovorna i Vintergatan intr\u00e4ffade f\u00f6r cirka 340 \u00e5r sedan i stj\u00e4rnbilden Kassiopeja, och kallas d\u00e4rf\u00f6r Kassiopeja A (Cas A).<\/p>\n<\/div>\n

Cas A ligger tiotusen ljus\u00e5r fr\u00e5n jorden. Observatorier som NASA:s och ESA:s rymdteleskop Hubble har genomf\u00f6rt detaljerade unders\u00f6kningar av det kvarvarande molnet av gl\u00f6dande gas och stoft.<\/p>\n

\"Zooming
Zooma in p\u00e5 Cassiopeia A<\/figcaption><\/figure>\n

Bilderna visar en s\u00f6ndersliten ring av material som r\u00f6r sig snabbt bort fr\u00e5n explosionsplatsen. En del av materialet r\u00f6r sig med en hastighet p\u00e5 cirka 50 miljoner km per timme (tillr\u00e4ckligt snabbt f\u00f6r att ta sig fr\u00e5n jorden till m\u00e5nen p\u00e5 30 sekunder!). De enorma virvlarna av spillror lyser eftersom de har v\u00e4rmts upp av chockv\u00e5gen fr\u00e5n supernovan n\u00e4r den passerade f\u00f6rbi.<\/p>\n

Det finns flera olika typer av supernovaexplosioner. Cas A exploderade n\u00e4r en liten stj\u00e4rna, en s\u00e5 kallad vit dv\u00e4rg, drog till sig stora m\u00e4ngder material fr\u00e5n en n\u00e4rliggande stj\u00e4rna. Allteftersom gasen ansamlades blev den vita dv\u00e4rgen s\u00e5 het och aktiv att den exploderade. Andra supernovor uppst\u00e5r n\u00e4r massiva stj\u00e4rnor tar slut p\u00e5 k\u00e4rnbr\u00e4nsle i sina k\u00e4rnor. Eftersom k\u00e4rnan inte l\u00e4ngre kan avge n\u00e5gon energi kollapsar den och f\u00f6rst\u00f6r stj\u00e4rnan.<\/p>\n

Supernovor \u00e4r viktiga eftersom de sprider stj\u00e4rnmaterial \u00f6ver hela galaxen. N\u00e4stan allt p\u00e5 jorden (inklusive oss!) best\u00e5r av grund\u00e4mnen (som kol och j\u00e4rn) som h\u00e4rstammar fr\u00e5n detta stj\u00e4rnstoft.<\/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\/sv\/wp-json\/wp\/v2\/posts\/881","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/comments?post=881"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/881\/revisions"}],"predecessor-version":[{"id":4717,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/881\/revisions\/4717"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=881"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=881"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=881"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=881"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=881"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=881"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=881"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=881"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=881"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}