{"id":1084,"date":"2009-08-21T09:40:00","date_gmt":"2009-08-21T07:40:00","guid":{"rendered":"https:\/\/kids.esa.int\/the_mystery_of_martian_methane\/"},"modified":"2026-10-08T00:35:50","modified_gmt":"2026-10-07T22:35:50","slug":"the_mystery_of_martian_methane","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/the_mystery_of_martian_methane\/","title":{"rendered":"Marsin metaanin mysteeri"},"content":{"rendered":"
\n

Onko Marsissa el\u00e4m\u00e4\u00e4? Kukaan ei tietenk\u00e4\u00e4n odota l\u00f6yt\u00e4v\u00e4ns\u00e4 \u00e4lykk\u00e4it\u00e4 marsilaisia, kuten elokuvassa \u2018Maailmojen sota\u2019 n\u00e4hdyt. ESA:n Mars Express -kiertoradalla toimivan luotaimen ja maassa sijaitsevien observatorioiden tulokset viittaavat kuitenkin siihen, ett\u00e4 punaisella planeetalla voisi piileskell\u00e4 yksinkertaisia el\u00e4m\u00e4nmuotoja maan alla.<\/p>\n<\/div>\n

Mysteerin avain on metaani, kaasu, jota k\u00e4ytet\u00e4\u00e4n maapallolla ruoanlaittoon ja l\u00e4mmitykseen. Suuri osa ilmakeh\u00e4ss\u00e4mme olevasta metaanista on per\u00e4isin kehittyneist\u00e4 el\u00e4m\u00e4nmuodoista, kuten ruokaa sulattavista naudoista. Metaania syntyy kuitenkin my\u00f6s muilla tavoin, kuten tulivuorenpurkauksissa.<\/p>\n

Metaania l\u00f6ydettiin Marsista vuonna 2003. Koska kaasu hajoaa helposti, sen elinajan Marsin ilmakeh\u00e4ss\u00e4 arvioitiin olevan noin 300 vuotta. Tarkempi analyysi osoitti, ett\u00e4 metaani oli itse asiassa keskittynyt kolmeen alueeseen. T\u00e4m\u00e4 osoitti, ett\u00e4 sit\u00e4 vapautui juuri sill\u00e4 hetkell\u00e4, ja havaitsimme sen ennen kuin se ehti levit\u00e4 ymp\u00e4ri planeettaa.<\/p>\n

Sitten Mars tarjosi uuden yll\u00e4tyksen. Sen sijaan, ett\u00e4 metaanin katoaminen olisi kest\u00e4nyt 300 vuotta, se oli h\u00e4vinnyt l\u00e4hes kokonaan jo vuoden 2006 alkuun menness\u00e4. Jokin poisti sit\u00e4 ilmakeh\u00e4st\u00e4 600 kertaa odotettua nopeammin. ESAn tutkijat ep\u00e4ilev\u00e4t, ett\u00e4 syyn\u00e4 saattaa olla planeetan pinta. Joko metaani j\u00e4\u00e4 kiinni p\u00f6lyyn tai eritt\u00e4in reaktiiviset kemikaalit, kuten vetyperoksidi, tuhoavat sen. T\u00e4m\u00e4 saattaa tarkoittaa, ett\u00e4 pinta on el\u00e4m\u00e4lle paljon vihamielisempi kuin aiemmin ajateltiin. Jos n\u00e4in on, tulevien tutkijoiden on porattava syv\u00e4lle maan alle etsi\u00e4kseen merkkej\u00e4 menneest\u00e4 tai nykyisest\u00e4 el\u00e4m\u00e4st\u00e4.<\/p>","protected":false},"excerpt":{"rendered":"

Is there life on Mars? Certainly, no one expects to find intelligent Martians, like those seen in the movie, ‘War of the Worlds’. However, results from ESA\u2019s Mars Express orbiter […]<\/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\/2008\/12\/mars_express6\/17874075-2-eng-GB\/Mars_Express.jpg","esa_banner_description":"Mars Express","esa_banner_credit":"Alex Lutkus","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/12\/Mars_Express6","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-1084","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\/1084","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=1084"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1084\/revisions"}],"predecessor-version":[{"id":2227,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1084\/revisions\/2227"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1084"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1084"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1084"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1084"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1084"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1084"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1084"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1084"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1084"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1084"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}