{"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\/da\/titan_s_tides_point_to_a_hidden_ocean\/","title":{"rendered":"Titanens tidevand tyder p\u00e5 et skjult hav"},"content":{"rendered":"
\n

Jorden kaldes ofte for den bl\u00e5 planet, fordi den er den eneste planet i vores solsystem, der i vid udstr\u00e6kning er d\u00e6kket af vand. Man mener dog, at en r\u00e6kke m\u00e5ner, herunder Saturns k\u00e6mpem\u00e5ne Titan, har oceaner under deres overflade. Det, der tyder p\u00e5, at der findes et underjordisk ocean p\u00e5 Titan, er opdagelsen af store tidevandsbev\u00e6gelser.<\/p>\n<\/div>\n

Enhver, der bes\u00f8ger kysten, kender til tidevandet \u2013 stigningen og faldet i havoverfladen to gange om dagen. Mindre \u00e5benlyse er de tidevands kr\u00e6fter, der f\u00e5r vores planets jordskorpe til at h\u00e6ve og s\u00e6nke sig med nogle f\u00e5 snese centimeter. Disse tidevands kr\u00e6fter skyldes den samlede tyngdekraft, som M\u00e5nen og Solen ud\u00f8ver p\u00e5 Jorden. Tidevandet p\u00e5 Titan opst\u00e5r p\u00e5 en lignende m\u00e5de. Men denne gang er det Saturns tiltr\u00e6kning, der f\u00e5r m\u00e5nen til at \u00e6ndre form i l\u00f8bet af sin 16-dages bane omkring planeten.<\/p>\n

Titans form\u00e6ndringer er blevet p\u00e5vist ved n\u00f8je at f\u00f8lge Cassini-rumfart\u00f8jets bane, n\u00e5r det flyver t\u00e6t forbi m\u00e5nen. Forskelle i den m\u00e5de, hvorp\u00e5 Titan p\u00e5virkede Cassini, viste, at m\u00e5nens tyngdekraft \u2013 og dermed dens form \u2013 havde \u00e6ndret sig ganske lidt. P\u00e5 det fjerneste punkt, hvor Saturns tiltr\u00e6kning er svagest, er Titan n\u00e6sten kugleformet, ligesom en fodbold. N\u00e5r m\u00e5nen er t\u00e6ttest p\u00e5 Saturn, str\u00e6kkes den ud, s\u00e5 den kommer til at ligne en rugbybold.<\/p>\n

De deraf f\u00f8lgende tidevandsbev\u00e6gelser f\u00e5r Titans overflade til at h\u00e6ve og s\u00e6nke sig med mere end 10 meter. Denne variation er imidlertid langt st\u00f8rre, end man ville forvente, hvis m\u00e5nen var fast hele vejen igennem. Dette tyder p\u00e5, at den har et underjordisk hav, muligvis 250 km dybt, under en isskal, der er omkring 50 km tyk.<\/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\/da\/wp-json\/wp\/v2\/posts\/728","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=728"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/728\/revisions"}],"predecessor-version":[{"id":1871,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/728\/revisions\/1871"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=728"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=728"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=728"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=728"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=728"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=728"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=728"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}