{"id":879,"date":"2006-07-27T09:13:00","date_gmt":"2006-07-27T07:13:00","guid":{"rendered":"https:\/\/kids.esa.int\/methane_lakes_and_ice_pebbles\/"},"modified":"2026-10-08T00:33:18","modified_gmt":"2026-10-07T22:33:18","slug":"methane_lakes_and_ice_pebbles","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/methane_lakes_and_ice_pebbles\/","title":{"rendered":"Metans\u00f8er og issten"},"content":{"rendered":"
\n

Saturns m\u00e5ne Titan er en af de st\u00f8rste og mest fascinerende m\u00e5ner i solsystemet. Desv\u00e6rre er dens overflade skjult bag et tykt lag af orange skyer. Indtil for nylig vidste ingen, hvordan Titans overflade ser ud.<\/p>\n<\/div>\n

En m\u00e5de at tr\u00e6nge igennem skylaget p\u00e5 er at bruge radarinstrumentet p\u00e5 NASAs rumfart\u00f8j Cassini. Radiosignaler fra Cassini passerer gennem skylaget og reflekteres tilbage fra overfladen. Ved at unders\u00f8ge ekkoerne har forskerne for nylig kunnet opdage mange m\u00f8rke pletter. Nogle af disse pletter h\u00e6nger sammen med smalle, snoede kanaler \u2013 muligvis floder.<\/p>\n

Det ser ud til, at de glatte, m\u00f8rke omr\u00e5der p\u00e5 radarbillederne er s\u00f8er. Titans overfladetemperatur er imidlertid -180 \u00b0C, s\u00e5 de kan ikke indeholde vand. I stedet ser de ud til at best\u00e5 af flydende metan eller etan. (P\u00e5 Jorden bruges metangas i kedler og komfurer.)<\/p>\n

\"First
F\u00f8rste farvebillede af Titans overflade<\/figcaption><\/figure>\n

Mange h\u00e5bede, at ESA\u2019s Huygens-sonde ville lande i en metans\u00f8 under sin nedstigning mod overfladen den 14. januar 2005. Imidlertid viste sondens kamera en t\u00f8r slette d\u00e6kket af issten.<\/p>\n

Siden denne spektakul\u00e6re succes har forskerne fundet en us\u00e6dvanlig m\u00e5de at l\u00e6re mere om Huygens\u2019 omgivelser p\u00e5. N\u00f8glen var et us\u00e6dvanligt op- og nedadg\u00e5ende m\u00f8nster i radiosignalet fra Huygens til Cassini. En del af radiostr\u00e5len blev reflekteret fra overfladen og gik ikke direkte til Cassini. En analyse af signalet viste, at overfladen er temmelig flad op til 2 km fra sonden. Denne t\u00f8rre s\u00f8bund er hovedsageligt d\u00e6kket af issten med en diameter p\u00e5 ca. 5-10 cm.<\/p>","protected":false},"excerpt":{"rendered":"

Saturn\u2019s moon Titan is one of the largest and most fascinating satellites in the Solar System. Unfortunately, its surface is hidden beneath a thick blanket of orange cloud. Until recently, […]<\/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\/2006\/07\/lakes_on_titan2\/18249176-2-eng-GB\/Lakes_on_Titan.jpg","esa_banner_description":"Lakes on Titan","esa_banner_credit":"NASA\/JPL","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2006\/07\/Lakes_on_Titan2","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-879","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\/879","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=879"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/879\/revisions"}],"predecessor-version":[{"id":4716,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/879\/revisions\/4716"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=879"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=879"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=879"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=879"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=879"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=879"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=879"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=879"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=879"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=879"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}