{"id":836,"date":"2004-12-02T15:57:00","date_gmt":"2004-12-02T14:57:00","guid":{"rendered":"https:\/\/kids.esa.int\/how_does_a_rocket_work\/"},"modified":"2026-10-08T00:32:49","modified_gmt":"2026-10-07T22:32:49","slug":"how_does_a_rocket_work","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/how_does_a_rocket_work\/","title":{"rendered":"Hvordan fungerer en raket?"},"content":{"rendered":"<div class=\"lede\">\n<p>Har du lagt m\u00e6rke til, hvad der sker, n\u00e5r man lader luften str\u00f8mme ud af en ballon? Luften str\u00f8mmer i den ene retning, og ballonen bev\u00e6ger sig i den modsatte retning. Raketter fungerer p\u00e5 stort set samme m\u00e5de. Udst\u00f8dningsgasser, der str\u00f8mmer ud af motorens dyse med h\u00f8j hastighed, skubber raketten fremad.<\/p>\n<\/div>\n<p>De fleste moderne raketter, s\u00e5som den europ\u00e6iske Ariane 5, er meget komplicerede og vejer flere hundrede ton ved opsendelsen. St\u00f8rstedelen af denne v\u00e6gt udg\u00f8res af br\u00e6ndstof, s\u00e5som flydende brint og flydende ilt.<\/p>\n<p>Raketter har brug for meget br\u00e6ndstof for at kunne overvinde Jordens tyngdekraft. F\u00f8rst n\u00e5r de n\u00e5r en hastighed p\u00e5 28 000 km\/t, bev\u00e6ger de sig hurtigt nok til at g\u00e5 i kredsl\u00f8b.<\/p>\n<p>De fleste raketter best\u00e5r af to eller tre trin. N\u00e5r et trin har forbrugt al sit br\u00e6ndstof, adskilles det for at slippe af med den un\u00f8dvendige v\u00e6gt. Det falder derefter ned (som regel i havet og langt v\u00e6k fra beboede omr\u00e5der) eller br\u00e6nder op i atmosf\u00e6ren.<\/p>\n<p>Store l\u00f8ftefart\u00f8jer f\u00e5r ofte et ekstra skub fra raketter, der er fastgjort til f\u00f8rste trin. Disse kan bruge fast eller flydende br\u00e6ndstof. Ogs\u00e5 disse kastes som regel v\u00e6k.<\/p>","protected":false},"excerpt":{"rendered":"<p>Have you noticed what happens if you let the air out of a balloon? The air goes one way and the balloon moves in the opposite direction. Rockets work in [&hellip;]<\/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\/12\/balloons2\/17894905-2-eng-GB\/balloons.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/12\/balloons2","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":[10,41,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-836","post","type-post","status-publish","format-standard","hentry","category-learn","category-rockets-technology","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/836","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=836"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/836\/revisions"}],"predecessor-version":[{"id":1979,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/836\/revisions\/1979"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=836"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=836"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=836"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=836"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=836"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=836"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=836"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}