{"id":920,"date":"2004-11-15T15:48:00","date_gmt":"2004-11-15T14:48:00","guid":{"rendered":"https:\/\/kids.esa.int\/titan\/"},"modified":"2026-10-08T00:33:47","modified_gmt":"2026-10-07T22:33:47","slug":"titan","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/titan\/","title":{"rendered":"Titan"},"content":{"rendered":"
\n

Titan on suurempi kuin Merkurius-planeetta. Se on my\u00f6s aurinkokunnan toiseksi suurin kuu ja ainoa kuu, jolla on tihe\u00e4 ilmakeh\u00e4. Aivan kuten Maassa, p\u00e4\u00e4asiallinen kaasu on typpi, mutta Titan on paljon kylmempi. Sen pinta on syv\u00e4ss\u00e4 pakkasessa, l\u00e4mp\u00f6tilan ollessa miinus 180 astetta Celsius. Jos siell\u00e4 l\u00e4mpenisi, Titanilla saattaisi olla edellytykset el\u00e4m\u00e4lle.<\/p>\n<\/div>\n

Ennen NASA:n ja ESA:n Cassini-Huygens-avaruusluotaimen saapumista vuonna 2004 Titanista tiedettiin vain v\u00e4h\u00e4n. Sen pinta on piilossa paksun oranssinv\u00e4risen pilvipeitteen alla.<\/p>\n

\"Titan's
Titanin ensimm\u00e4inen l\u00e4hikuva<\/figcaption><\/figure>\n

14. tammikuuta 2005 ESA:n Huygens-luotain laskeutui historiallisesti Titaniin. 2\u00bd tunnin laskeutumisen aikana Huygensia puhaltivat it\u00e4\u00e4n yli 100 km\/h:n nopeudella puhaltavat korkean tason tuulet. Tuulet k\u00e4\u00e4ntyiv\u00e4t suunnan 7 km:n korkeudella ja kuljettivat Huygensia lempe\u00e4sti l\u00e4nteen laskeutumisen viimeisin\u00e4 minuutteina. Huygens l\u00f6ysi j\u00e4isen maiseman, jota leimasivat tummat kanavat, jotka kiemurtelivat kohti sile\u00e4\u00e4 \u2018rannikkoa\u2019.<\/p>\n

Titanin ilmakeh\u00e4 koostuu noin 5 prosentista metaania. Auringonvalon vaikutuksesta metaaniin syntyy paksu oranssi sumu. (Maapallolla metaanikaasua poltetaan kattiloissa ja liesiss\u00e4.) Metaanisateet t\u00e4ytt\u00e4v\u00e4t toisinaan kuivat uomat ja muodostavat v\u00e4liaikaisia jokia, jotka kuluttavat pintaa ja kuljettavat irtonaista ainesta l\u00e4heisille tasangoille.<\/p>\n

Yli 70 Titanin ohilennon aikana Cassinin tutka- ja infrapunalaitteet ovat kartoittaneet suuren osan planeetan pinnasta. Niiden avulla on l\u00f6ydetty monia outoja piirteit\u00e4, kuten valtavia hiilivetyhiekasta muodostuneita dyynit, vuorijonoja, metaanij\u00e4rvi\u00e4 ja mahdollisia j\u00e4\u00e4vuoria. (Hiilivedyt koostuvat vedyst\u00e4 ja hiilest\u00e4. Esimerkkej\u00e4 niist\u00e4 maapallolla ovat hiili, noki ja terva.)<\/p>","protected":false},"excerpt":{"rendered":"

Titan is larger than the planet Mercury. It is also the second largest moon in the Solar System, and the only moon with a dense atmosphere. Just as on Earth, […]<\/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\/10\/huygens_probe_descending_through_titan_s_atmosphere4\/18244995-2-eng-GB\/Huygens_probe_descending_through_Titan_s_atmosphere.jpg","esa_banner_description":"Huygens probe descending through Titan's atmosphere","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/10\/Huygens_probe_descending_through_Titan_s_atmosphere4","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-920","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\/920","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=920"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/920\/revisions"}],"predecessor-version":[{"id":4740,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/920\/revisions\/4740"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=920"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=920"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=920"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=920"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=920"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=920"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=920"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}