{"id":897,"date":"2008-06-17T09:24:00","date_gmt":"2008-06-17T07:24:00","guid":{"rendered":"https:\/\/kids.esa.int\/goce_esa_s_gravity_explorer\/"},"modified":"2026-10-08T00:33:31","modified_gmt":"2026-10-07T22:33:31","slug":"goce_esa_s_gravity_explorer","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/goce_esa_s_gravity_explorer\/","title":{"rendered":"GOCE \u2013 ESA\u2019s tyngdekraftsonder"},"content":{"rendered":"
\n

Vidste du, at din v\u00e6gt varierer en smule, afh\u00e6ngigt af hvor du bor? Det skyldes, at Jordens tyngdekraft varierer fra sted til sted. Pr\u00e6cis hvor meget tyngdekraften varierer, bliver nu m\u00e5lt af ESA\u2019s GOCE-satellit (Gravity field and steady-state Ocean Circulation Explorer).<\/p>\n<\/div>\n

GOCE, der blev opsendt i marts 2009, er den f\u00f8rste af ESA\u2019s Earth Explorer-missioner. Dens opgave er at levere de hidtil bedste oplysninger om planetens \u2018tyngdefelt\u2019.<\/p>\n

Tyngdekraften er den kraft, der holder os alle fast p\u00e5 Jorden. Uden den ville alle (og alt), der ikke var fastgjort, sv\u00e6ve v\u00e6k ud i rummet. Jordens tyngdekraft varierer dog 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, dybe havgravene samt tykkelsen og t\u00e6theden af bjergartslagene.<\/p>\n

\"Earth's
Jordens geoid set fra GOCE<\/figcaption><\/figure>\n

Det er meget vanskeligt at m\u00e5le sm\u00e5 variationer i tyngdekraften, is\u00e6r fra rummet. For at kunne registrere det st\u00e6rkest mulige tyngdekraftssignal kredser GOCE i en lav bane, 255 km over Jorden. N\u00e5r rumfart\u00f8jet passerer over omr\u00e5der med henholdsvis st\u00e6rkere og svagere tyngdekraft, bev\u00e6ger det sig op og ned, og dets instrumenter registrerer disse \u00e6ndringer langs banen.<\/p>\n

Den pilformede GOCE er desuden yderst stabil, da den ikke har nogen af de bev\u00e6gelige dele, man ofte ser p\u00e5 andre rumfart\u00f8jer. Et avanceret system til holdningsstyring sikrer, at dens tyngdekraftsm\u00e5linger ikke p\u00e5virkes af satellitens bev\u00e6gelser.<\/p>\n

Hvorfor er det vigtigt at m\u00e5le tyngdekraften pr\u00e6cist? Data fra GOCE bruges til at unders\u00f8ge havstr\u00f8mme, \u00e6ndringer i havniveauet, landoverfladens h\u00f8jde og dybden af bjergfodene. Det har ogs\u00e5 mange praktiske anvendelsesmuligheder, for eksempel inden for byggebranchen.<\/p>","protected":false},"excerpt":{"rendered":"

Did you know that your weight is slightly different, depending on where you live? This is because the pull of Earth\u2019s gravity varies from place to place. Precisely how much […]<\/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\/sunny_side_of_goce3\/17887395-2-eng-GB\/Sunny_side_of_GOCE.jpg","esa_banner_description":"Sunny side of GOCE","esa_banner_credit":"ESA\u2013AOES-Medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/03\/Sunny_side_of_GOCE3","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":[42,10,66],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-897","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-water-world"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/897","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=897"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/897\/revisions"}],"predecessor-version":[{"id":4727,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/897\/revisions\/4727"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=897"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=897"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=897"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=897"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=897"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=897"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=897"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}