{"id":820,"date":"2004-12-02T15:35:00","date_gmt":"2004-12-02T14:35:00","guid":{"rendered":"https:\/\/kids.esa.int\/gravity_assists\/"},"modified":"2026-10-08T00:32:39","modified_gmt":"2026-10-07T22:32:39","slug":"gravity_assists","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/gravity_assists\/","title":{"rendered":"Gravitasjonsassistanse"},"content":{"rendered":"
\n

Som du vet, har en bil en tendens til \u00e5 bremse ned n\u00e5r den kj\u00f8rer opp en bakke og til \u00e5 akselerere n\u00e5r den kj\u00f8rer nedover. Man kan si at bilen f\u00e5r \u2018tyngdekraftshjelp\u2019, siden jordens tyngdekraft bidrar til at den bremser opp eller akselererer. P\u00e5 samme m\u00e5te er det mulig for et romfart\u00f8y \u00e5 f\u00e5 en gratis tur, uten \u00e5 bruke verdifullt drivstoff.<\/p>\n<\/div>\n

Gravitasjonsman\u00f8vrer finner sted n\u00e5r et romfart\u00f8y flyr forbi en planet eller en stor m\u00e5ne. Dette gj\u00f8r at planetens tyngdekraft kan p\u00e5virke romfart\u00f8yet og endre dets bane.<\/p>\n

Noen ganger \u00f8ker romfart\u00f8yet farten, andre ganger bremser det ned \u2013 avhengig av om det passerer bak eller foran planeten. Gravitasjonsman\u00f8veren endrer ogs\u00e5 retningen romfart\u00f8yet beveger seg i.<\/p>\n

En av de mest imponerende gravitasjonsassistanse-man\u00f8vrene ble brukt i ESAs Ulysses-oppdrag. Ved \u00e5 passere over Jupiters nordpol ble Ulysses slengt inn i en bane som f\u00f8rte den over Solens poler.<\/p>\n

Cassini-Huygens-oppdraget benyttet seg av fire gravitasjonsman\u00f8vrer (\u00e9n med Jorden, to med Venus og \u00e9n med Jupiter) p\u00e5 sin ferd mot Saturn.<\/p>\n

Tyngdekraften spilte ogs\u00e5 en rolle i ESAs SMART-1-oppdrag. Etter \u00e5 ha beveget seg i spiral bort fra Jorden i 14 m\u00e5neder, begynte romfart\u00f8yet \u00e5 merke tyngdekraften fra M\u00e5nen. I november 2004 ble SMART-1 fanget av M\u00e5nens tyngdekraft og gikk inn i bane rundt den.<\/p>","protected":false},"excerpt":{"rendered":"

As you know, a car tends to slow down when it goes up a mountain and to accelerate when it is going downhill. One can say that the car is […]<\/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\/08\/ulysses_and_the_heliosphere2\/17889541-2-eng-GB\/Ulysses_and_the_heliosphere.jpg","esa_banner_description":"Ulysses and the heliosphere","esa_banner_credit":"ESA (image by D. Hardy)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/08\/Ulysses_and_the_heliosphere2","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-820","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\/820","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=820"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/820\/revisions"}],"predecessor-version":[{"id":1963,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/820\/revisions\/1963"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=820"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=820"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=820"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=820"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=820"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=820"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=820"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=820"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=820"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=820"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}