{"id":193,"date":"2021-12-02T12:45:12","date_gmt":"2021-12-02T11:45:12","guid":{"rendered":"https:\/\/kids.esa.int\/comets\/"},"modified":"2026-10-08T00:25:20","modified_gmt":"2026-10-07T22:25:20","slug":"comets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/comets\/","title":{"rendered":"Kometer"},"content":{"rendered":"
\n

I oldtiden frygtede man kometer \u2013 man mente, at de bragte uheld eller varslede katastrofer. I dag ved vi, at kometer er sm\u00e5 isverdener, der er tilbage fra planeternes dannelse. Man mener, at der findes milliarder af kometer i udkanten af solsystemet, l\u00e6ngere ude end Plutos bane.<\/p>\n<\/div>\n

De fleste kometer er s\u00e5 sm\u00e5 og ligger s\u00e5 langt v\u00e6k, at vi ikke kan se dem, selv ikke med de st\u00f8rste teleskoper. Men vi kan se dem, n\u00e5r de bev\u00e6ger sig ind mod Solen og danner haler af gas og st\u00f8v. (Ordet \u2018komet\u2019 betyder \u00bbh\u00e5ret stjerne\u00ab.)<\/p>\n

Solens varme f\u00e5r isen til at omdannes til gas, der str\u00f8mmer millioner af kilometer ud i rummet. Trods deres l\u00e6ngde er de st\u00f8vpartikler, de indeholder, ikke st\u00f8rre end sandkorn.<\/p>\n

\"Rosetta
Rosetta \u2013 kometj\u00e6geren<\/figcaption><\/figure>\n

Nogle kometer bruger kun f\u00e5 \u00e5r p\u00e5 at kredse om Solen. Andre \u2013 som Halleys komet \u2013 tager meget l\u00e6ngere tid. Atter andre dukker op \u00e9n gang og ses aldrig igen. ESA\u2019s SOHO-rumfart\u00f8j har v\u00e6ret med til at opdage tusindvis af sm\u00e5 kometer, der flyver meget t\u00e6t p\u00e5 Solen. Mange af dem styrter ned i Solen eller rives fra hinanden af dens st\u00e6rke tyngdekraft.<\/p>\n

I 2014 vil det europ\u00e6iske rumfart\u00f8j Rosetta skrive historie ved at g\u00e5 i kredsl\u00f8b om en komet og sende en landingsfart\u00f8j ned p\u00e5 dens overflade.<\/p>","protected":false},"excerpt":{"rendered":"

Ancient people were afraid of comets \u2013 they were said to bring bad luck or foretell disaster. We now know that comets are small ice worlds that have been left […]<\/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\/04\/giotto_s_art_shows_a_comet_in_the_background2\/17913109-2-eng-GB\/Giotto_s_art_shows_a_comet_in_the_background.jpg","esa_banner_description":"Giotto's art shows a comet in the background","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/04\/Giotto_s_art_shows_a_comet_in_the_background2","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":[46,10,11],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-193","post","type-post","status-publish","format-standard","hentry","category-comets-and-meteors","category-learn","category-our-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/193","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=193"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/193\/revisions"}],"predecessor-version":[{"id":4350,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/193\/revisions\/4350"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=193"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=193"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=193"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=193"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=193"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=193"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=193"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}