{"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\/sv\/titan_s_tides_point_to_a_hidden_ocean\/","title":{"rendered":"Titans tidvatten tyder p\u00e5 ett dolt hav"},"content":{"rendered":"
\n

Jorden kallas ofta f\u00f6r den bl\u00e5 planeten, eftersom den \u00e4r den enda v\u00e4rlden i v\u00e5rt solsystem som till stor del t\u00e4cks av vatten. Man tror dock att ett antal satelliter, d\u00e4ribland Saturnus j\u00e4ttem\u00e5ne Titan, har hav under sina ytor. Ledtr\u00e5den till att det finns ett hav under Titans yta kommer fr\u00e5n uppt\u00e4ckten av kraftiga tidvatten.<\/p>\n<\/div>\n

Alla som bes\u00f6ker kusten k\u00e4nner till tidvattnet \u2013 hur havsniv\u00e5n stiger och sjunker tv\u00e5 g\u00e5nger om dagen. Mindre uppenbara \u00e4r de tidvattenkrafter som f\u00e5r v\u00e5r planets jordskorpa att h\u00f6jas och s\u00e4nkas med n\u00e5gra tiotal centimeter. Dessa tidvattenkrafter orsakas av m\u00e5nens och solens samverkande gravitationskraft p\u00e5 jorden. Tidvattnet p\u00e5 Titan uppst\u00e5r p\u00e5 ett liknande s\u00e4tt. Men i detta fall \u00e4r det Saturnus som med sin gravitationskraft f\u00e5r m\u00e5nen att \u00e4ndra form under sin 16-dagars omloppsbana runt planeten.<\/p>\n

Titans formf\u00f6r\u00e4ndringar har uppt\u00e4ckts genom noggrann sp\u00e5rning av rymdsonden Cassinis bana n\u00e4r den flyger n\u00e4ra m\u00e5nen. Skillnader i hur Titan p\u00e5verkade Cassini visade att m\u00e5nens gravitationskraft \u2013 och d\u00e4rmed dess form \u2013 hade f\u00f6r\u00e4ndrats mycket marginellt. Vid sin yttersta punkt, n\u00e4r Saturnus gravitationskraft \u00e4r svagare, \u00e4r Titan n\u00e4stan sf\u00e4risk, som en fotboll. N\u00e4r m\u00e5nen befinner sig n\u00e4rmast Saturnus str\u00e4cks den ut s\u00e5 att den mer liknar en rugbyboll.<\/p>\n

De tidvattenkrafter som uppst\u00e5r f\u00e5r Titans yta att h\u00f6jas och s\u00e4nkas med mer \u00e4n 10 meter. Denna variation \u00e4r dock betydligt st\u00f6rre \u00e4n vad man skulle f\u00f6rv\u00e4nta sig om m\u00e5nen vore helt fast genomg\u00e5ende. Detta tyder p\u00e5 att den har ett underjordiskt hav, m\u00f6jligen 250 km djupt, under ett isskal som \u00e4r cirka 50 km tjockt.<\/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\/sv\/wp-json\/wp\/v2\/posts\/728","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/comments?post=728"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/728\/revisions"}],"predecessor-version":[{"id":1871,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/728\/revisions\/1871"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=728"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=728"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=728"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=728"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=728"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=728"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=728"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}