{"id":887,"date":"2007-03-16T12:23:00","date_gmt":"2007-03-16T11:23:00","guid":{"rendered":"https:\/\/kids.esa.int\/radar_s_icy_echoes_on_mars\/"},"modified":"2026-10-08T00:33:23","modified_gmt":"2026-10-07T22:33:23","slug":"radar_s_icy_echoes_on_mars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/radar_s_icy_echoes_on_mars\/","title":{"rendered":"Radars iskalde ekko p\u00e5 Mars"},"content":{"rendered":"
\n

Mars blir ofte sett p\u00e5 som en t\u00f8rr verden dekket av \u00f8rkener. Men akkurat som Jorden har den r\u00f8de planeten to store iskapper ved nord- og s\u00f8rpolen. Hvis mennesker en dag skal bo p\u00e5 Mars, er det viktig \u00e5 vite hvor mye frossent vann som finnes i disse isdekkene. Dette er nettopp det som n\u00e5 blir kartlagt av MARSIS-instrumentet ombord p\u00e5 ESAs romsonde Mars Express.<\/p>\n<\/div>\n

For \u00e5 m\u00e5le tykkelsen p\u00e5 den s\u00f8rlige iskappen sender radarinstrumentet usynlige signaler mot overflaten og registrerer ekkoene. P\u00e5 denne m\u00e5ten kan radaren \u2018se\u2019 gjennom lagene helt ned til bunnen av isen. Det er laget mer enn 300 av disse \u2018tverrsnittene\u2019 gjennom is- og st\u00f8vavsetningene som dekker polen.<\/p>\n

\"Thickness
Tykkelsen p\u00e5 de lagdelte avsetningene ved Mars' s\u00f8rpol<\/figcaption><\/figure>\n

Vi vet n\u00e5 at den s\u00f8rlige iskappen er opptil 3,7 km tykk. Hvis all isen smeltet, ville hele planeten bli dekket av et hav som var omtrent 11 meter dypt. Til tross for vekten av dette enorme isdekket har berggrunnen under isen ikke blitt presset ned \u2013 noe som tyder p\u00e5 at den er stivere enn jordskorpen.<\/p>\n

P\u00e5g\u00e5ende radarunders\u00f8kelser av den nordlige polkappe har vist at den er omtrent 1,8 km tykk. De tynne lagene av vannis og st\u00f8v ved begge polene ser ut til \u00e5 skyldes sesongmessige og langsiktige klimaendringer. Selv om polkapperne inneholder det meste av det kjente vannet p\u00e5 dagens Mars, kan andre steder p\u00e5 planeten ha v\u00e6rt fuktige nok til \u00e5 kunne huse liv i en fjern fortid.<\/p>","protected":false},"excerpt":{"rendered":"

Mars is often regarded as an arid world covered by deserts. However, like Earth, the Red Planet has two large ice caps at its north and south poles. If people […]<\/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\/2007\/03\/bright_lower_echo_from_mars_south-polar_layered_deposits2\/17901975-2-eng-GB\/Bright_lower_echo_from_Mars_south-polar_layered_deposits.jpg","esa_banner_description":"Bright lower echo from Mars\u2019 south-polar layered deposits","esa_banner_credit":"NASA\/JPL\/ASI\/ESA\/Univ. of Rome\/MOLA Science Team","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/03\/Bright_lower_echo_from_Mars_south-polar_layered_deposits2","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":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-887","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/887","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=887"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/887\/revisions"}],"predecessor-version":[{"id":4723,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/887\/revisions\/4723"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=887"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=887"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=887"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=887"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=887"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=887"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=887"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=887"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=887"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=887"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}