{"id":1031,"date":"2005-05-02T12:13:00","date_gmt":"2005-05-02T10:13:00","guid":{"rendered":"https:\/\/kids.esa.int\/radar_to_reveal_hidden_mars\/"},"modified":"2026-10-08T00:35:05","modified_gmt":"2026-10-07T22:35:05","slug":"radar_to_reveal_hidden_mars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/radar_to_reveal_hidden_mars\/","title":{"rendered":"Radar skal afsl\u00f8re det skjulte Mars"},"content":{"rendered":"
\n

Et nyt kapitel i udforskningen af Mars st\u00e5r for d\u00f8ren. Efter en lang forsinkelse er MARSIS-radarinstrumentet ombord p\u00e5 ESA\u2019s Mars Express-rumsonde nu klar til at tr\u00e6de i aktion.<\/p>\n<\/div>\n

MARSIS er det f\u00f8rste instrument, der er udviklet til at kigge ned under Mars\u2019 orange-r\u00f8de overflade. Det fungerer ved at sende lavfrekvente radiosignaler ned mod overfladen.<\/p>\n

Mange af disse signaler reflekteres direkte tilbage fra overfladen. Men nogle signaler tr\u00e6nger ned gennem jorden og reflekteres fra lag under overfladen.<\/p>\n

Ved at analysere disse ekkoer h\u00e5ber forskerne at finde is eller vand under jorden. Det er vigtigt, fordi liv som regel er knyttet til tilstedev\u00e6relsen af vand.<\/p>\n

MARSIS vil ogs\u00e5 kunne registrere bjergartslag ned til en dybde p\u00e5 flere kilometer og m\u00e5le h\u00f8jden p\u00e5 bjerge og dale.<\/p>\n

\"MARSIS
MARSIS\u2019 hovedantenne<\/figcaption><\/figure>\n

Inden dette kan ske, skal radarens tre stanglignende arme foldes ud. De skulle have v\u00e6ret udl\u00f8st i april 2004, men der var en vis bekymring for, at de kunne s\u00e6tte sig fast eller springe tilbage og beskadige rumfart\u00f8jet.<\/p>\n

\u201cS\u00e5danne operationer kan ikke demonstreres her p\u00e5 Jorden,\u201d forklarede John Reddy fra ESA. \u201cDerfor er vi n\u00f8dt til at stole p\u00e5 computersimuleringer, medmindre de kan afpr\u00f8ves i rummet.\u201d<\/p>\n

Efter en grundig analyse af risiciene har ESA besluttet at gennemf\u00f8re eksperimentet. De to 20 m lange bomme vil blive sat ud f\u00f8rst, efterfulgt af den 7 m lange bom et par dage senere. Dette forventes at finde sted mellem den 2. og den 12. maj.<\/p>\n

N\u00e5r installationen er afsluttet, vil MARSIS gennemg\u00e5 tre ugers testforl\u00f8b. Derefter g\u00e5r den sp\u00e6ndende radars\u00f8gning i gang.<\/p>","protected":false},"excerpt":{"rendered":"

A new chapter in the exploration of Mars is about to begin. After a long delay, the MARSIS radar instrument on board ESA\u2019s Mars Express orbiter is about to swing […]<\/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\/2001\/08\/marsis_prospecting_for_water2\/17863678-3-eng-GB\/MARSIS_prospecting_for_water.jpg","esa_banner_description":"MARSIS prospecting for water","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2001\/08\/MARSIS_prospecting_for_water2","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-1031","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\/1031","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=1031"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1031\/revisions"}],"predecessor-version":[{"id":4806,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1031\/revisions\/4806"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=1031"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=1031"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=1031"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=1031"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=1031"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=1031"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=1031"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=1031"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=1031"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=1031"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}