{"id":973,"date":"2005-12-05T10:52:00","date_gmt":"2005-12-05T09:52:00","guid":{"rendered":"https:\/\/kids.esa.int\/water_on_mars_but_not_a_drop_to_drink\/"},"modified":"2026-10-08T00:34:23","modified_gmt":"2026-10-07T22:34:23","slug":"water_on_mars_but_not_a_drop_to_drink","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/water_on_mars_but_not_a_drop_to_drink\/","title":{"rendered":"Vett\u00e4 Marsissa \u2013 mutta ei tippaakaan juotavaksi"},"content":{"rendered":"<div class=\"lede\">\n<p>Marsin pinta on nyky\u00e4\u00e4n yht\u00e4 kuiva kuin aavikko, mutta ESA:n Mars Express -luotaimen uudet tulokset vahvistavat, ett\u00e4 vedell\u00e4 on ollut t\u00e4rke\u00e4 rooli planeetan historiassa. Luotaimen herk\u00e4t mittalaitteet vahvistavat, ett\u00e4 kuiva Punainen planeetta oli aikoinaan paljon kosteampi ja ett\u00e4 vesij\u00e4\u00e4t\u00e4 on todenn\u00e4k\u00f6isesti laajalti pinnan alla.<\/p>\n<\/div>\n<p>Viime kes\u00e4n\u00e4 muutaman viikon ajan kiertolaitteen tutka l\u00e4hetti radiosignaaleja, jotka l\u00e4p\u00e4isiv\u00e4t pinnan ja heijastuivat takaisin maanalaisista kerroksista. N\u00e4iden kaikujen analysointi on paljastanut kaarevia rakenteita, jotka saattavat olla maan alle hautautuneiden t\u00f6rm\u00e4yskraatterien ulkoreunoja.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"800\" data-credit=\"NASA\/ESA, J. Bell (Cornell U.) and M. Wolff (SSI)\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/08\/Hubble_s_close_encounter_with_Mars2\" 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\/2003\/08\/hubble_s_close_encounter_with_mars2\/17867008-3-eng-GB\/Hubble_s_close_encounter_with_Mars.jpg\" alt=\"Hubble&#x27;s close encounter with Mars\"><figcaption>Hubblen l\u00e4heinen kohtaaminen Marsin kanssa<\/figcaption><\/figure>\n<p>Yksi l\u00e4hes py\u00f6re\u00e4 rakenne, jonka halkaisija on noin 250 km, sijaitsee 1,5\u20132,5 km:n syvyydess\u00e4 Chryse Planitia -alueen pohjoisten alankomaiden alla. Tutkijat uskovat, ett\u00e4 se saattaa sis\u00e4lt\u00e4\u00e4 paksun kerroksen vesij\u00e4\u00e4pitoista ainesta. L\u00e4hemp\u00e4n\u00e4 Marsin pohjoisnapaa voimakkaat kaikuehdot viittaavat l\u00e4hes puhtaan, yli 1 km paksun vesij\u00e4\u00e4kerroksen olemassaoloon, joka sijaitsee vulkaanisen \u201cmaaper\u00e4n\u201d kerroksen p\u00e4\u00e4ll\u00e4.<\/p>\n<p>MARSIS-tutkaa on k\u00e4ytetty my\u00f6s ilmakeh\u00e4n yl\u00e4osan \u2013 ionosf\u00e4\u00e4rin \u2013 tutkimiseen. Kaikueista k\u00e4y ilmi, ett\u00e4 t\u00e4ll\u00e4 alueella olevan s\u00e4hk\u00f6istyneen kaasun k\u00e4ytt\u00e4ytymisen ja planeetan kiinte\u00e4n kuoren voimakkaiden magneettikenttien v\u00e4lill\u00e4 on vahva yhteys.<\/p>\n<p>Toinen laite, nimelt\u00e4\u00e4n OMEGA, on havainnut kivimineraaleja, jotka ovat muuttuneet nestem\u00e4isen veden vaikutuksesta. N\u00e4m\u00e4 \u2018hydratoituneet\u2019 mineraalit osoittavat, ett\u00e4 Marsissa oli miljardeja vuosia sitten suuria m\u00e4\u00e4ri\u00e4 vett\u00e4 \u2013 ja ett\u00e4 olosuhteet saattoivat tuolloin olla suotuisat el\u00e4m\u00e4n syntymiselle.<\/p>","protected":false},"excerpt":{"rendered":"<p>The surface of Mars is now as dry as a desert, but new results from ESA\u2019s Mars Express confirm that water has played an important role in the planet\u2019s history. [&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\/2005\/11\/mars_express_s_omega_instrument_adds_detail_to_candor_chasma3\/17911528-2-eng-GB\/Mars_Express_s_OMEGA_instrument_adds_detail_to_Candor_Chasma.jpg","esa_banner_description":"Mars Express's OMEGA instrument adds detail to Candor Chasma","esa_banner_credit":"ESA\/OMEGA\/HRSC","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/11\/Mars_Express_s_OMEGA_instrument_adds_detail_to_Candor_Chasma3","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-973","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\/973","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=973"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/973\/revisions"}],"predecessor-version":[{"id":4766,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/973\/revisions\/4766"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=973"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=973"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=973"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=973"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=973"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=973"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=973"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=973"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}