{"id":728,"date":"2012-07-03T12:27:00","date_gmt":"2012-07-03T10:27:00","guid":{"rendered":"https:\/\/kids.esa.int\/titan_s_tides_point_to_a_hidden_ocean\/"},"modified":"2026-10-08T00:31:37","modified_gmt":"2026-10-07T22:31:37","slug":"titan_s_tides_point_to_a_hidden_ocean","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/titan_s_tides_point_to_a_hidden_ocean\/","title":{"rendered":"Tidvannet p\u00e5 Titan tyder p\u00e5 et skjult hav"},"content":{"rendered":"
\n

Jorden kalles ofte \u00abden bl\u00e5 planeten\u00bb, fordi den er den eneste planeten i solsystemet v\u00e5rt som i stor grad er dekket av vann. Man antar imidlertid at en rekke m\u00e5ner, blant annet Saturns gigantiske m\u00e5ne Titan, har hav under overflaten. Ledetr\u00e5den til at det finnes et underjordisk hav p\u00e5 Titan, stammer fra oppdagelsen av store tidevannsbevegelser.<\/p>\n<\/div>\n

Alle som bes\u00f8ker kysten, kjenner til tidevannet \u2013 hvordan havniv\u00e5et stiger og synker to ganger hver dag. Mindre \u00e5penbare er tidevannene som f\u00e5r jordskorpen til \u00e5 heve og senke seg noen titalls centimeter. Disse tidevannene skyldes den samlede tyngdekraften fra M\u00e5nen og Solen p\u00e5 Jorden. Tidevannet p\u00e5 Titan oppst\u00e5r p\u00e5 en lignende m\u00e5te. Men denne gangen er det Saturns tiltrekningskraft som f\u00e5r m\u00e5nen til \u00e5 endre form i l\u00f8pet av sin 16-dagers bane rundt planeten.<\/p>\n

Titans formendring er blitt oppdaget ved n\u00f8ye sporing av romfart\u00f8yet Cassinis bane n\u00e5r det flyr tett forbi m\u00e5nen. Forskjeller i m\u00e5ten Titan p\u00e5virket Cassini p\u00e5, viste at m\u00e5nens gravitasjonskraft \u2013 og dermed dens form \u2013 hadde endret seg sv\u00e6rt litt. P\u00e5 det fjerneste punktet, n\u00e5r Saturns tiltrekningskraft er svakest, er Titan nesten sf\u00e6risk, som en fotball. N\u00e5r m\u00e5nen er n\u00e6rmest Saturn, blir den strukket ut slik at den ligner mer p\u00e5 en rugbyball.<\/p>\n

De p\u00e5f\u00f8lgende tidevannskreftene f\u00f8rer til at Titans overflate hever seg og senker seg med mer enn 10 meter. Denne variasjonen er imidlertid mye st\u00f8rre enn man ville forvente dersom m\u00e5nen var helt gjennomg\u00e5ende fast. Dette tyder p\u00e5 at den har et underjordisk hav, muligens 250 km dypt, under et islag som er rundt 50 km tykt.<\/p>","protected":false},"excerpt":{"rendered":"

Earth is often known as the blue planet, because it is the only world in our Solar System which is largely covered by water. However, a number of satellites, including […]<\/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\/2012\/06\/titan_s_tides_raised_by_saturn2\/17912925-2-eng-GB\/Titan_s_tides_raised_by_Saturn.jpeg","esa_banner_description":"","esa_banner_credit":"NASA\/JPL","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2012\/06\/Titan_s_tides_raised_by_Saturn2","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":[10,11,12],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-728","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/728","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=728"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/728\/revisions"}],"predecessor-version":[{"id":1871,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/728\/revisions\/1871"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=728"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=728"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=728"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=728"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=728"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=728"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=728"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}