{"id":624,"date":"2013-09-19T09:25:00","date_gmt":"2013-09-19T07:25:00","guid":{"rendered":"https:\/\/kids.esa.int\/re-entry_nears_for_esa_s_ferrari_of_space\/"},"modified":"2026-10-08T00:30:24","modified_gmt":"2026-10-07T22:30:24","slug":"re-entry_nears_for_esa_s_ferrari_of_space","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/re-entry_nears_for_esa_s_ferrari_of_space\/","title":{"rendered":"ESA\u2019s \u2018Ferrari i rummet\u2019 n\u00e6rmer sig sin tilbagevenden til atmosf\u00e6ren\u2019"},"content":{"rendered":"
\n

Efter mere end fire \u00e5r i kredsl\u00f8b n\u00e6rmer ESA\u2019s GOCE-mission sig sin afslutning. I midten af oktober vil satellitten l\u00f8be t\u00f8r for br\u00e6ndstof, og dens kredsl\u00f8b vil begynde at forringes. Det forventes, at den vil tr\u00e6nge ind i atmosf\u00e6ren omkring tre uger senere.<\/p>\n<\/div>\n

GOCE har kredset om Jorden siden marts 2009 i en h\u00f8jde p\u00e5 under 270 km, hvilket er us\u00e6dvanligt lavt for en videnskabelig satellit. Dens opgave har v\u00e6ret at kortl\u00e6gge de sm\u00e5 variationer i Jordens overfladegravitation med en uovertruffen pr\u00e6cision.<\/p>\n

Tyngdekraften er den kraft, der tr\u00e6kker alt mod jorden. Jordens tyngdekraft varierer dog en smule fra sted til sted. Det skyldes blandt andet, at planeten ikke er helt rund \u2013 den er let affladet ved polerne. Tyngdekraften p\u00e5virkes ogs\u00e5 af h\u00f8je bjerge og dybe havgraver samt af havets og bjergartslagernes tykkelse og t\u00e6thed.<\/p>\n

\"New
Ny GOCE-geoid<\/figcaption><\/figure>\n

N\u00e5r GOCE passerer over omr\u00e5der med forskellig tyngdekraft, bev\u00e6ger rumfart\u00f8jet sig op og ned, og dets instrumenter registrerer disse \u00e6ndringer i dets bane. S\u00e5danne pr\u00e6cise m\u00e5linger er blevet muliggjort af dets lave kredsl\u00f8b og det str\u00f8mlinede, aerodynamiske design, hvilket har f\u00f8rt til, at det har f\u00e5et tilnavnet \u2018rummets Ferrari\u2019. Den unikke satellit er desuden yderst stabil, da den ikke har nogen af de bev\u00e6gelige dele, der ofte anvendes p\u00e5 andre rumfart\u00f8jer.<\/p>\n

Data fra GOCE er blevet brugt til at unders\u00f8ge havstr\u00f8mme, \u00e6ndringer i havniveauet, landoverfladens h\u00f8jde og den lagdelte struktur i Jordens bjergartsskorpe. Den registrerede endda vinde i rummet og lydb\u00f8lger, der bev\u00e6gede sig opad gennem atmosf\u00e6ren efter det voldsomme jordsk\u00e6lv, der ramte Japan den 11. marts 2011. Det m\u00e5ske vigtigste resultat har v\u00e6ret en bem\u00e6rkelsesv\u00e6rdig n\u00f8jagtig model (kendt som \u2018geoidet\u2019) af Jordens tyngdekraft. Geoidet viser, hvordan Jorden ville se ud, hvis tyngdekraften var ens overalt p\u00e5 dens overflade, s\u00e5ledes at vandet ikke ville str\u00f8mme fra et punkt til et andet.<\/p>","protected":false},"excerpt":{"rendered":"

After more than four years in orbit, ESA\u2019s GOCE mission is nearing its end. In mid-October, the satellite will run out of fuel and its orbit will begin to decay. […]<\/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\/2008\/03\/goce_in_orbit4\/18246217-2-eng-GB\/GOCE_in_orbit.jpg","esa_banner_description":"GOCE in orbit","esa_banner_credit":"ESA\/AOES Medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/03\/GOCE_in_orbit4","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":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-624","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/624","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=624"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/624\/revisions"}],"predecessor-version":[{"id":4591,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/624\/revisions\/4591"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=624"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=624"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=624"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=624"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=624"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=624"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=624"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=624"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=624"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}