{"id":922,"date":"2004-11-15T15:45:00","date_gmt":"2004-11-15T14:45:00","guid":{"rendered":"https:\/\/kids.esa.int\/water_on_mars\/"},"modified":"2026-10-08T00:33:48","modified_gmt":"2026-10-07T22:33:48","slug":"water_on_mars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/water_on_mars\/","title":{"rendered":"Vesi Marsissa"},"content":{"rendered":"
\n

Monessa mieless\u00e4 Mars on kaikista planeetoista se, joka muistuttaa eniten Maata. Vierailija huomaisi, ett\u00e4 p\u00e4iv\u00e4 Marsissa on vain hieman pidempi kuin Maassa. Mars on my\u00f6s kallistunut suunnilleen yht\u00e4 paljon kuin Maa, joten siell\u00e4 on vuodenaikoja.<\/p>\n<\/div>\n

Sek\u00e4 Marsilla ett\u00e4 Maalla on valkoiset napaj\u00e4\u00e4tik\u00f6t. Marsin napaj\u00e4\u00e4tik\u00f6t ovat paljon pienempi\u00e4 ja ohuempia, joten ne kasvavat nopeasti talvella ja h\u00e4vi\u00e4v\u00e4t l\u00e4hes kokonaan kes\u00e4ll\u00e4. Ne ovat paljon kylmempi\u00e4 kuin Maan napaj\u00e4\u00e4tik\u00f6t, joten ne sis\u00e4lt\u00e4v\u00e4t sek\u00e4 j\u00e4\u00e4tynytt\u00e4 hiilidioksidia (\u2018kuivaa j\u00e4\u00e4t\u00e4\u2019, jota k\u00e4ytet\u00e4\u00e4n sumun luomiseen n\u00e4ytt\u00e4m\u00f6esityksiss\u00e4) ett\u00e4 vesij\u00e4\u00e4t\u00e4.<\/p>\n

\"Cracks
Marsin halkeamat viittaavat veden esiintymiseen<\/figcaption><\/figure>\n

Mars on keskell\u00e4 j\u00e4\u00e4kautta, joten sen pinnalla ei t\u00e4ll\u00e4 hetkell\u00e4 voi esiinty\u00e4 nestem\u00e4ist\u00e4 vett\u00e4. Planeetta n\u00e4ytt\u00e4\u00e4 kuitenkin olleen aiemmin l\u00e4mpim\u00e4mpi ja kosteampi.<\/p>\n

Avaruusluotainten ottamissa kuvissa on n\u00e4hty mutkittelevia kanavia, jotka muistuttavat kuivuneita jokiuomia. Ne viittaavat siihen, ett\u00e4 pinnalla on aikoinaan virrannut valtavia m\u00e4\u00e4ri\u00e4 vett\u00e4 \u2013 mahdollisesti sulaneen j\u00e4\u00e4n sy\u00f6tt\u00e4m\u00e4n\u00e4. Saattaa olla, ett\u00e4 siell\u00e4 on jopa satanut sadetta ja lunta. Monet uomista n\u00e4ytt\u00e4v\u00e4t t\u00e4ytt\u00e4neen suuria kraattereita tai laskeneen pohjoisille tasangoille. Jotkut tutkijat uskovat, ett\u00e4 Marsin pohjoisosaa peitti aikoinaan suuri valtameri.<\/p>\n

Mihin vesi on mennyt? Osa siit\u00e4 on saattanut haihtua avaruuteen. Loput on j\u00e4\u00e4tynyt maaper\u00e4\u00e4n.<\/p>","protected":false},"excerpt":{"rendered":"

In many ways, Mars is the most Earthlike of all the planets. A visitor would find that a day on Mars is only slightly longer than one on Earth. Mars […]<\/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\/2004\/01\/omega_image_of_the_southern_polar_cap_of_mars_18_january2\/17912443-2-eng-GB\/OMEGA_image_of_the_southern_polar_cap_of_Mars_18_January.jpg","esa_banner_description":"OMEGA image of the southern polar cap of Mars 18 January","esa_banner_credit":"ESA - OMEGA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/01\/OMEGA_image_of_the_southern_polar_cap_of_Mars_18_January2","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":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-922","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/922","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=922"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/922\/revisions"}],"predecessor-version":[{"id":4741,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/922\/revisions\/4741"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=922"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=922"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=922"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=922"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=922"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=922"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=922"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}