{"id":371,"date":"2018-08-23T13:06:00","date_gmt":"2018-08-23T11:06:00","guid":{"rendered":"https:\/\/kids.esa.int\/de_l_eau_liquide_a_ete_trouvee_sur_mars\/"},"modified":"2026-10-08T00:27:24","modified_gmt":"2026-10-07T22:27:24","slug":"de_l_eau_liquide_a_ete_trouvee_sur_mars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/de_l_eau_liquide_a_ete_trouvee_sur_mars\/","title":{"rendered":"Marsista on l\u00f6ydetty nestem\u00e4ist\u00e4 vett\u00e4!"},"content":{"rendered":"<div class=\"lede\">\n<p>Mars Express -avaruusluotain on juuri tehnyt uskomattoman l\u00f6yd\u00f6n: se on havainnut merkkej\u00e4 nestem\u00e4isest\u00e4 vedest\u00e4 Punaisella planeetalla! Koska tiedeyhteis\u00f6 on etsinyt vett\u00e4 Marsista jo useiden vuosien ajan, t\u00e4ll\u00e4 l\u00f6yd\u00f6ll\u00e4 voi olla ratkaiseva merkitys.<\/p>\n<\/div>\n<p>Kauan sitten suuri osa Marsin pinnasta oli merien, jokien ja j\u00e4rvien peitossa. Voimme todeta t\u00e4m\u00e4n nyky\u00e4\u00e4nkin, sill\u00e4 Marsilla on valtavia kuivuneita laaksoja, joita eri avaruusluotaimet ovat kuvanneet lukuisia kertoja. Useat laskeutujat ja tutkimusroverit ovat lis\u00e4ksi l\u00f6yt\u00e4neet sielt\u00e4 muinaisia mineraaleja, jotka voivat muodostua ainoastaan 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>Siit\u00e4 huolimatta t\u00e4m\u00e4 vesi ei voinut pysy\u00e4 ikuisesti nestem\u00e4isess\u00e4 tilassa. Marsin ilmasto muuttui lopulta, ja vaikka Mars Express oli aiemmin havainnut j\u00e4\u00e4tynytt\u00e4 vett\u00e4 punaisen planeetan napakylmiss\u00e4, nestem\u00e4ist\u00e4 vett\u00e4 ei nyky\u00e4\u00e4n voida kuvitella olevan Marsin pinnalla. Siksi tutkijat p\u00e4\u00e4ttiv\u00e4t tutkia Marsin maaper\u00e4\u00e4! T\u00e4t\u00e4 varten he k\u00e4yttiv\u00e4t Mars Expressin MARSIS-laitetta, edistyksellist\u00e4 Mars-tutkaa, jolla voidaan tutkia punaisen planeetan maaper\u00e4\u00e4 ja ionosf\u00e4\u00e4ri\u00e4. MARSIS on \u00abmaaper\u00e4n l\u00e4p\u00e4isev\u00e4 tutka\u00bb, mik\u00e4 tarkoittaa, ett\u00e4 se voi l\u00e4hett\u00e4\u00e4 tutkaimpulsseja kiertoradalta Marsin pinnalle. Tallentamalla aaltojen paluuaikaa ja voimakkuutta kiertoradalla olevaan l\u00e4hettimeen tutkijaryhm\u00e4t voivat yritt\u00e4\u00e4 selvitt\u00e4\u00e4, mit\u00e4 maaper\u00e4n alla on. Se on varsin nerokasta!<\/p>\n<p>MARSIS-laitteen ker\u00e4\u00e4mien tietojen pohjalta tehdyn tutkimuksen avulla on tehty kauan odotettu l\u00f6yt\u00f6. Marsin etel\u00e4napaj\u00e4\u00e4tik\u00f6ss\u00e4 on lukuisia j\u00e4\u00e4- ja p\u00f6lykerroksia, joiden syvyys on 1,5 km ja jotka ulottuvat noin 200 km:n pituiselle alueelle. Noin 20 km:n laajuisen, erityisen kirkkaan tutkheijastuksen havaitseminen n\u00e4iden kerrostumien alla her\u00e4tti tutkijoiden huomion. Tutkijat arvioivat, ett\u00e4 kyseess\u00e4 saattaisi olla suuri nestem\u00e4isen veden j\u00e4rvi!<\/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>Maapallolla tietyt mikrobiel\u00e4m\u00e4n muodot el\u00e4v\u00e4t vesilammikoissa, joiden olosuhteet eiv\u00e4t sovellu ihmisel\u00e4m\u00e4lle. Voisivatko mikroskooppiset olennot el\u00e4\u00e4 t\u00e4ss\u00e4 marsilaisessa vedess\u00e4? Marsilla saattaa olla muita j\u00e4rvi\u00e4 ja vesialueita sen pinnan alla. Mit\u00e4 salaisuuksia ne mahtavat k\u00e4tke\u00e4?<\/p>\n<p>Mars Express -hankkeen tutkijoista Dmitri Titov toteaa: \u00abT\u00e4m\u00e4 kiehtova l\u00f6yt\u00f6 on historiallinen tieteellinen l\u00e4pimurto, joka auttaa meit\u00e4 ymm\u00e4rt\u00e4m\u00e4\u00e4n paitsi Marsin kehityst\u00e4 my\u00f6s veden historiaa t\u00e4ll\u00e4 planeetalla ja sen mahdollista asuttavuutta.\u00bb<\/p>\n<p>Haluaisitteko tutkia Marsin maaper\u00e4\u00e4? Mit\u00e4 luulette, mit\u00e4 sielt\u00e4 voisi l\u00f6yty\u00e4?<\/p>\n<p><b>Tiesitk\u00f6 t\u00e4m\u00e4n?<\/b> Mars Express on kiert\u00e4nyt Punaisen planeetan kiertoradalla jo 15 vuotta!<\/p>","protected":false},"excerpt":{"rendered":"<p>La sonde spatiale Mars Express vient de faire une incroyable d\u00e9couverte : elle a d\u00e9tect\u00e9 des signes d\u2019eau \u00e0 l\u2019\u00e9tat liquide sur la Plan\u00e8te rouge ! Alors que la communaut\u00e9 [&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-371","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\/371","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=371"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/371\/revisions"}],"predecessor-version":[{"id":4419,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/371\/revisions\/4419"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=371"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=371"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=371"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=371"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=371"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=371"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=371"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}