{"id":877,"date":"2005-06-30T09:24:00","date_gmt":"2005-06-30T07:24:00","guid":{"rendered":"https:\/\/kids.esa.int\/esa_s_gravity_explorer\/"},"modified":"2026-10-08T00:33:17","modified_gmt":"2026-10-07T22:33:17","slug":"esa_s_gravity_explorer","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/esa_s_gravity_explorer\/","title":{"rendered":"ESA\u2019s Gravity Explorer"},"content":{"rendered":"
\n

If\u00f8lge en ny unders\u00f8gelse fra ESA \u00f8delagde jordsk\u00e6lvet p\u00e5 Sumatra den 26. december 2004 ikke blot et enormt omr\u00e5de, men \u00e6ndrede ogs\u00e5 tyngdekraften i dette omr\u00e5de en smule.<\/p>\n<\/div>\n

Da bunden af Det Indiske Ocean under jordsk\u00e6lvet forsk\u00f8d sig langs en 1000 km lang forkastningslinje, dannede der sig en 6 meter h\u00f8j kant. Denne enorme bev\u00e6gelse af bjergarter \u00e6ndrede \u00f8jeblikkeligt den lokale tyngdekraft.<\/p>\n

Det er ikke us\u00e6dvanligt. Kort baseret p\u00e5 satellitdata viser, at tyngdekraften varierer fra sted til sted. En af \u00e5rsagerne hertil er Jordens rotation. N\u00e5r planeten drejer rundt, bule den udad ved \u00e6kvator. Da Jorden er 42 km bredere ved \u00e6kvator, er tyngdekraften svagere der end ved polerne.<\/p>\n

H\u00f8je bjerge, dybe havgraver og forskellige bjergarter inde i Jorden spiller ogs\u00e5 en rolle. Selv tidevand, havstr\u00f8mme og smeltende iskapper f\u00e5r tyngdekraften til at variere.<\/p>\n

\"Artist's
Kunstnerisk fremstilling af GOCE<\/figcaption><\/figure>\n

I \u00f8jeblikket er det vanskeligt at m\u00e5le s\u00e5danne sm\u00e5 \u00e6ndringer i tyngdekraften, men det vil \u00e6ndre sig med n\u00e6ste \u00e5rs opsendelse af ESA\u2019s Gravity Field and Ocean Circulation Explorer (GOCE).<\/p>\n

Det f\u00f8lsomme rumfart\u00f8j vil unders\u00f8ge tyngdekraften i detaljer. N\u00e5r det passerer omr\u00e5der med st\u00e6rkere og svagere tyngdekraft, vil rumfart\u00f8jet bev\u00e6ge sig op og ned, og dets instrumenter vil registrere \u00e6ndringerne i tyngdefeltet langs dets bane.<\/p>\n

Dette vil give forskerne mulighed for at m\u00e5le, hvor meget materiale der flyttes rundt \u2013 enten pludseligt ved et jordsk\u00e6lv eller gradvist, som f.eks. n\u00e5r en iskappe smelter. Dataene vil endda bidrage til at afd\u00e6kke \u00e6ndringer i havcirkulationen, der h\u00e6nger sammen med klimaforandringerne.<\/p>","protected":false},"excerpt":{"rendered":"

According to a new ESA study, the Sumatran earthquake of 26 December 2004 not only devastated a huge area, but it slightly altered the gravity of that area. When 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\/2005\/04\/ers-2_composite_highlighting_tsunami_damage3\/17891576-2-eng-GB\/ERS-2_composite_highlighting_tsunami_damage.jpg","esa_banner_description":"ERS-2 composite highlighting tsunami damage","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/04\/ERS-2_composite_highlighting_tsunami_damage3","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":[42,10,59],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-877","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-natural-disasters"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/877","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=877"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/877\/revisions"}],"predecessor-version":[{"id":4715,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/877\/revisions\/4715"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=877"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=877"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=877"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=877"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=877"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=877"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=877"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=877"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=877"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}