{"id":370,"date":"2018-08-23T13:47:00","date_gmt":"2018-08-23T11:47:00","guid":{"rendered":"https:\/\/kids.esa.int\/liquid_water_found_on_mars\/"},"modified":"2026-10-08T00:27:23","modified_gmt":"2026-10-07T22:27:23","slug":"liquid_water_found_on_mars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/liquid_water_found_on_mars\/","title":{"rendered":"Marsista on l\u00f6ydetty nestem\u00e4ist\u00e4 vett\u00e4!"},"content":{"rendered":"<div class=\"lede\">\n<p>ESAn Mars Express -avaruusluotain on tehnyt h\u00e4mm\u00e4stytt\u00e4v\u00e4n l\u00f6yd\u00f6n: merkkej\u00e4 nestem\u00e4isest\u00e4 vedest\u00e4 Punaisella planeetalla! Tutkijat ovat etsineet vett\u00e4 jo pitk\u00e4\u00e4n, ja t\u00e4m\u00e4 l\u00e4pimurto voi osoittautua eritt\u00e4in t\u00e4rke\u00e4ksi.<\/p>\n<\/div>\n<p>Kauan sitten Marsin pinta oli suurelta osin merien, jokien ja j\u00e4rvien peitossa. Tied\u00e4mme t\u00e4m\u00e4n, koska nyky\u00e4\u00e4n voimme havaita Marsin pinnalla esimerkiksi valtavia kuivuneita jokilaaksoja. Kiertoradalla olevat avaruusalukset ovat kuvanneet n\u00e4it\u00e4 alueita uskomattoman yksityiskohtaisesti. Pintaa tutkivat laskeutujat ja marsroverit ovat my\u00f6s l\u00f6yt\u00e4neet mineraaleja, jotka voivat muodostua vain nestem\u00e4isess\u00e4 vedess\u00e4.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"5333\" data-credit=\"Copyright Context map: NASA\/Viking; THEMIS background: NASA\/JPL-Caltech\/Arizona State University; MARSIS data: ESA\/NASA\/JPL\/ASI\/Univ. Rome; R. Orosei et al 2018\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/08\/Mars_Express_detects_water_buried_under_the_south_pole_of_Mars\" 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\/2018\/08\/mars_express_detects_water_buried_under_the_south_pole_of_mars\/18250213-2-eng-GB\/Mars_Express_detects_water_buried_under_the_south_pole_of_Mars.jpg\" alt=\"Mars Express detects water buried under the south pole of Mars\"><figcaption>Mars Express havaitsee vett\u00e4 Marsin etel\u00e4navan alla<\/figcaption><\/figure>\n<p>Mutta t\u00e4m\u00e4 vesi ei kest\u00e4nyt ikuisesti. Marsin ilmasto muuttui, ja \u2013 vaikka Mars Express on aiemmin osoittanut, ett\u00e4 planeetan navoilla on j\u00e4\u00e4tynytt\u00e4 vett\u00e4 \u2013 nestem\u00e4ist\u00e4 vett\u00e4 ei nyky\u00e4\u00e4n voi esiinty\u00e4 pinnalla. Siksi tutkijat p\u00e4\u00e4ttiv\u00e4t tutkia maaper\u00e4\u00e4! He k\u00e4yttiv\u00e4t Mars Expressin erityist\u00e4 MARSIS-laitetta (<b>M<\/b>ars <b>A<\/b>edistynyt <b>R<\/b>tunnistin <b>S<\/b>pinnan alla ja <b>I<\/b>onosf\u00e4\u00e4ri <b>S<\/b>(kaiku)laite. MARSIS on \u201cmaaper\u00e4n l\u00e4p\u00e4isev\u00e4 tutka\u201d. T\u00e4m\u00e4 tarkoittaa, ett\u00e4 se l\u00e4hett\u00e4\u00e4 tutkapulsseja kiertoradalta kohti Marsin pintaa. Mittaamalla, kuinka kauan pulssien paluu kest\u00e4\u00e4 ja kuinka voimakkaita ne ovat, tutkijat voivat selvitt\u00e4\u00e4, millainen maaper\u00e4n alla on. Nerokasta!<\/p>\n<p>MARSIS-laitteella tehdyss\u00e4 tutkimuksessa l\u00f6ydettiin se, mit\u00e4 tutkijat olivat etsineet. Marsin etel\u00e4napa-alue koostuu monista j\u00e4\u00e4- ja p\u00f6lykerroksista, jotka ulottuvat noin 1,5 km:n syvyyteen asti tutkittavalla 200 km:n levyisell\u00e4 alueella. N\u00e4iden kerrostumien alta l\u00f6ydettiin erityisen kirkas, 20 km leve\u00e4 tutkaheijastus. Tutkijat uskovat sen olevan suuri nestem\u00e4isen veden lampi!<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1920\" data-credit=\"ESA\/DLR\/FU Berlin, CC BY-SA 3.0 IGO\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/08\/Perspective_view_of_Libya_Montes\" data-licence=\"CC BY-SA 3.0 IGO or 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\/2018\/08\/perspective_view_of_libya_montes\/17894240-2-eng-GB\/Perspective_view_of_Libya_Montes.jpg\" alt=\"Perspective view of Libya Montes\"><figcaption>Libya Montesin perspektiivikuva<\/figcaption><\/figure>\n<p>Jotkut maapallon mikro-organismit el\u00e4v\u00e4t vesilammikoissa, joiden olosuhteissa ihmisen olisi mahdotonta selviyty\u00e4, joten suuri kysymys onkin, uiskenteleeko n\u00e4iss\u00e4 Marsin vesiss\u00e4 pieni\u00e4 olentoja? Marsin pinnan alla saattaa hyvinkin olla paljon muita lampia ja j\u00e4rvi\u00e4, jotka odottavat vain l\u00f6yt\u00e4j\u00e4\u00e4ns\u00e4. Mit\u00e4 salaisuuksia ne k\u00e4tkev\u00e4t sis\u00e4\u00e4ns\u00e4?<\/p>\n<p>ESA:n Mars Express -hankkeen tutkija Dmitri Titov kiteytt\u00e4\u00e4 asian parhaiten: \u201cT\u00e4m\u00e4 j\u00e4nnitt\u00e4v\u00e4 l\u00f6yt\u00f6 on planeettatutkimuksen kohokohta, ja se auttaa meit\u00e4 ymm\u00e4rt\u00e4m\u00e4\u00e4n paremmin Marsin kehityst\u00e4, veden historiaa naapuriplaneetallamme sek\u00e4 sen asuttavuutta.\u201d<\/p>\n<p>Haluaisitko tutkia Marsin maanalaisia j\u00e4rvi\u00e4? Mit\u00e4 luulet, ett\u00e4 sielt\u00e4 voisi l\u00f6yty\u00e4?<\/p>\n<p><b>Mielenkiintoinen fakta:<\/b> Mars Express on kiert\u00e4nyt Punaista planeettaa jo 15 vuotta!<\/p>","protected":false},"excerpt":{"rendered":"<p>ESA\u2019s Mars Express spacecraft has made an amazing discovery: signs of liquid water on the Red Planet! Scientists have been searching for water for a long time, and this breakthrough [&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\/2018\/08\/mars_express\/17883547-2-eng-GB\/Mars_Express.jpg","esa_banner_description":"Mars Express","esa_banner_credit":"ESA\/ATG medialab; Mars: ESA\/DLR\/FU Berlin, CC BY-SA 3.0 IGO","esa_banner_licence":"CC BY-SA 3.0 IGO or ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/08\/Mars_Express","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":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-370","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/370","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=370"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/370\/revisions"}],"predecessor-version":[{"id":4418,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/370\/revisions\/4418"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=370"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=370"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=370"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=370"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=370"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=370"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=370"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=370"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=370"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}