{"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\/da\/radar_s_icy_echoes_on_mars\/","title":{"rendered":"Radars iskolde ekkoer p\u00e5 Mars"},"content":{"rendered":"<div class=\"lede\">\n<p>Mars betragtes ofte som en t\u00f8r verden, der er d\u00e6kket af \u00f8rkener. Men ligesom Jorden har den R\u00f8de Planet to store iskapper ved sin nord- og sydpol. Hvis mennesker en dag skal bo p\u00e5 Mars, er det vigtigt at vide, hvor meget frosset vand der findes i disse iskapper. Det er netop det, som MARSIS-instrumentet ombord p\u00e5 ESA\u2019s Mars Express-rumsonde er ved at afd\u00e6kke.<\/p>\n<\/div>\n<p>For at m\u00e5le tykkelsen af den sydlige iskappe sender radarinstrumentet usynlige signaler mod overfladen og registrerer ekkoerne. P\u00e5 denne m\u00e5de kan radaren \u2018se\u2019 gennem lagene ned til isens bund. Der er foretaget mere end 300 af disse \u2018tv\u00e6rsnit\u2019 gennem de aflejringer af is og st\u00f8v, der d\u00e6kker polen.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"2369\" data-credit=\"NASA\/JPL\/ASI\/ESA\/Univ. of Rome\/MOLA Science Team\/USGS\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/03\/Thickness_of_Mars_South_Polar_Layered_Deposits2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2007\/03\/thickness_of_mars_south_polar_layered_deposits2\/17892316-2-eng-GB\/Thickness_of_Mars_South_Polar_Layered_Deposits.jpg\" alt=\"Thickness of Mars&#x27; South Polar Layered Deposits\"><figcaption>Tykkelsen af de lagdelte aflejringer ved Mars' sydpol<\/figcaption><\/figure>\n<p>Vi ved nu, at den sydlige iskappe er op til 3,7 km tyk. Hvis al isen smeltede, ville hele planeten v\u00e6re d\u00e6kket af et hav, der var omkring 11 meter dybt. P\u00e5 trods af denne enorme iskappes v\u00e6gt er klippen under isen ikke blevet presset ned \u2013 et tegn p\u00e5, at den er stivere end Jordens skorpe.<\/p>\n<p>L\u00f8bende radarunders\u00f8gelser af den nordlige polkappe har vist, at den er omkring 1,8 km tyk. De tynde lag af vandis og st\u00f8v ved begge poler synes at v\u00e6re for\u00e5rsaget af s\u00e6sonbestemte og langsigtede klima\u00e6ndringer. Selvom polkapperne rummer det meste af det kendte vand p\u00e5 det moderne Mars, kan andre steder p\u00e5 planeten have v\u00e6ret fugtige nok til at kunne huse liv i en fjern fortid.<\/p>","protected":false},"excerpt":{"rendered":"<p>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 [&hellip;]<\/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\/da\/wp-json\/wp\/v2\/posts\/887","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=887"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/887\/revisions"}],"predecessor-version":[{"id":4723,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/887\/revisions\/4723"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=887"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=887"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=887"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=887"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=887"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=887"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=887"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=887"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=887"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=887"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}