{"id":823,"date":"2004-12-09T15:52:00","date_gmt":"2004-12-09T14:52:00","guid":{"rendered":"https:\/\/kids.esa.int\/space_velocity\/"},"modified":"2026-10-08T00:32:41","modified_gmt":"2026-10-07T22:32:41","slug":"space_velocity","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/space_velocity\/","title":{"rendered":"Romhastighet"},"content":{"rendered":"
\n

Objekter som beveger seg rundt en planet kalles satellitter. Hver gang en satellitt fullf\u00f8rer en runde rundt planeten, kalles dette en bane.<\/p>\n<\/div>\n

Jorden v\u00e5r har \u00e9n naturlig satellitt \u2013 M\u00e5nen. Siden oktober 1957 har det imidlertid blitt plassert mange tusen kunstige (menneskeskapte) satellitter i bane rundt Jorden.<\/p>\n

For \u00e5 holde seg i bane m\u00e5 en satellitt bevege seg med sv\u00e6rt h\u00f8y hastighet, som avhenger av h\u00f8yden. For en sirkul\u00e6r bane i en h\u00f8yde p\u00e5 300 km over jordoverflaten kreves det derfor vanligvis en hastighet p\u00e5 7,8 km\/s (28 000 km\/t). Med denne hastigheten vil satellitten fullf\u00f8re \u00e9n oml\u00f8psbane rundt Jorden p\u00e5 90 minutter.<\/p>\n

Satellitter m\u00e5 bevege seg s\u00e5 raskt for \u00e5 kompensere for jordens tyngdekraft. Dette kan sammenlignes med n\u00e5r noen kaster en cricketball eller en baseball. Jo hardere ballen kastes, desto lenger vil den fly f\u00f8r den treffer bakken.<\/p>\n

Hvis en spiller kunne kaste ballen hardt nok til at den oppn\u00e5dde den n\u00f8dvendige hastigheten, ville ballen g\u00e5 i bane rundt jorden. Den ville aldri falle tilbake til jorden. Kast den enda hardere, slik at den n\u00e5r en hastighet p\u00e5 11,2 km\/s (40 300 km\/t) \u2013 kjent som \u2018flukthastighet\u2019 \u2013 og ballen vil forlate Jorden helt. Den vil da bli en \u2018satellitt\u2019 til Solen.<\/p>","protected":false},"excerpt":{"rendered":"

Objects that travel around a planet are called satellites. Each complete journey a satellite makes around the planet is called an orbit. Our Earth has one natural satellite \u2013 the […]<\/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\/newton_s_cannon2\/17886950-2-eng-GB\/Newton_s_cannon.gif","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\/Newton_s_cannon2","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":[10,65,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-823","post","type-post","status-publish","format-standard","hentry","category-learn","category-mission-control","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/823","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=823"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/823\/revisions"}],"predecessor-version":[{"id":1966,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/823\/revisions\/1966"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=823"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=823"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=823"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=823"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=823"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=823"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=823"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=823"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=823"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=823"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}