{"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\/sv\/radar_s_icy_echoes_on_mars\/","title":{"rendered":"Radarns isiga ekon p\u00e5 Mars"},"content":{"rendered":"
\n

Mars betraktas ofta som en torr v\u00e4rld t\u00e4ckt av \u00f6knar. Men precis som Jorden har den r\u00f6da planeten tv\u00e5 stora ist\u00e4cken vid sina nord- och sydpoler. Om m\u00e4nniskor en dag ska kunna bo p\u00e5 Mars \u00e4r det viktigt att veta hur mycket fryst vatten som finns i dessa ist\u00e4cken. Det \u00e4r just detta som MARSIS-instrumentet ombord p\u00e5 ESA:s rymdsond Mars Express nu h\u00e5ller p\u00e5 att kartl\u00e4gga.<\/p>\n<\/div>\n

F\u00f6r att m\u00e4ta tjockleken p\u00e5 den s\u00f6dra ist\u00e4cken s\u00e4nder radarinstrumentet osynliga signaler mot ytan och registrerar ekona. P\u00e5 detta s\u00e4tt kan radarn \u2018se\u2019 genom lagren \u00e4nda ner till isens botten. Mer \u00e4n 300 s\u00e5dana \u2018snitt\u2019 har gjorts genom de is- och dammavlagringar som t\u00e4cker polen.<\/p>\n

\"Thickness
Tjockleken p\u00e5 de skiktade avlagringarna vid Mars sydpol<\/figcaption><\/figure>\n

Vi vet nu att den s\u00f6dra iskappen \u00e4r upp till 3,7 km tjock. Om all is sm\u00e4lte skulle hela planeten t\u00e4ckas av ett hav som \u00e4r cirka 11 meter djupt. Trots vikten av denna enorma ist\u00e4cke har berggrunden under isen inte tryckts ned \u2013 ett bevis p\u00e5 att den \u00e4r styvare \u00e4n jordskorpan.<\/p>\n

P\u00e5g\u00e5ende radarunders\u00f6kningar av den norra polkappen har visat att den \u00e4r cirka 1,8 km tjock. De tunna skikten av vattenis och damm vid b\u00e5da polerna tycks bero p\u00e5 s\u00e4songsbundna och l\u00e5ngsiktiga klimatf\u00f6r\u00e4ndringar. \u00c4ven om polkapparna rymmer det mesta av det k\u00e4nda vattnet p\u00e5 dagens Mars, kan andra platser p\u00e5 planeten ha varit tillr\u00e4ckligt fuktiga f\u00f6r att kunna hysa liv i ett avl\u00e4gset f\u00f6rflutet.<\/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\/sv\/wp-json\/wp\/v2\/posts\/887","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=887"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/887\/revisions"}],"predecessor-version":[{"id":4723,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/887\/revisions\/4723"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=887"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=887"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=887"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=887"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=887"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=887"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=887"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=887"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=887"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=887"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}