{"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\/fi\/radar_to_reveal_hidden_mars\/","title":{"rendered":"Tutka paljastaa Marsin salatut puolet"},"content":{"rendered":"
\n

Marsin tutkimuksessa on alkamassa uusi luku. Pitk\u00e4n viiv\u00e4styksen j\u00e4lkeen ESA:n Mars Express -kiertoradalla sijaitseva MARSIS-tutka on pian valmis aloittamaan toimintansa.<\/p>\n<\/div>\n

MARSIS on ensimm\u00e4inen laite, joka on suunniteltu tutkimaan Marsin oranssinpunaisen pinnan alla olevia alueita. Se toimii l\u00e4hett\u00e4m\u00e4ll\u00e4 alasp\u00e4in matalataajuisia radiosignaaleja.<\/p>\n

Monet n\u00e4ist\u00e4 heijastuvat suoraan takaisin pinnalta. Jotkut signaalit kuitenkin tunkeutuvat maaper\u00e4n l\u00e4pi ja heijastuvat maaper\u00e4n syvemmist\u00e4 kerroksista.<\/p>\n

Analysoimalla n\u00e4it\u00e4 kaikuja tutkijat toivovat l\u00f6yt\u00e4v\u00e4ns\u00e4 maanalaisia j\u00e4\u00e4- tai vesivarantoja. T\u00e4m\u00e4 on t\u00e4rke\u00e4\u00e4, sill\u00e4 el\u00e4m\u00e4 liittyy yleens\u00e4 veden esiintymiseen.<\/p>\n

MARSIS havaitsee my\u00f6s kalliokerroksia useiden kilometrien syvyyteen asti ja mittaa vuorten ja laaksojen korkeutta.<\/p>\n

\"MARSIS
MARSIS-p\u00e4\u00e4antenni<\/figcaption><\/figure>\n

Ennen kuin t\u00e4m\u00e4 voi tapahtua, tutkan kolme sauvanmuotoista puomia on avattava. Ne olisi pit\u00e4nyt vapauttaa huhtikuussa 2004, mutta oli jonkin verran huolta siit\u00e4, ett\u00e4 ne saattaisivat juuttua kiinni tai ponnahtaa takaisin ja vahingoittaa avaruusaluksen.<\/p>\n

\u201cT\u00e4llaisia k\u00e4ytt\u00f6\u00f6nottoja ei voida testata maan p\u00e4\u00e4ll\u00e4\u201d, selitti ESA:n John Reddy. \u201cSiksi meid\u00e4n on turvauduttava tietokonesimulaatioihin, ellei niit\u00e4 voida testata avaruudessa.\u201d<\/p>\n

Riskien huolellisen analysoinnin j\u00e4lkeen ESA on p\u00e4\u00e4tt\u00e4nyt toteuttaa kokeen. Ensin lasketaan veteen kaksi 20 metri\u00e4 pitk\u00e4\u00e4 puomia, ja muutama p\u00e4iv\u00e4 my\u00f6hemmin 7 metrin pituinen puomi. T\u00e4m\u00e4n odotetaan tapahtuvan 2.\u201312. toukokuuta.<\/p>\n

Kun asennus on valmis, MARSIS-laitteelle tehd\u00e4\u00e4n kolmen viikon mittaiset testit. Sen j\u00e4lkeen alkaa j\u00e4nnitt\u00e4v\u00e4 tutkahaku.<\/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\/fi\/wp-json\/wp\/v2\/posts\/1031","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=1031"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1031\/revisions"}],"predecessor-version":[{"id":4806,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1031\/revisions\/4806"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1031"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1031"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1031"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1031"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1031"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1031"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1031"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1031"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1031"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1031"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}