{"id":545,"date":"2015-01-28T07:45:00","date_gmt":"2015-01-28T06:45:00","guid":{"rendered":"https:\/\/kids.esa.int\/getting_to_know_rosetta_s_comet\/"},"modified":"2026-10-08T00:29:28","modified_gmt":"2026-10-07T22:29:28","slug":"getting_to_know_rosetta_s_comet","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/getting_to_know_rosetta_s_comet\/","title":{"rendered":"Tutustuminen Rosettan komeettaan"},"content":{"rendered":"
\n

On kulunut satoja vuosia siit\u00e4, kun Kristoffer Kolumbus purjehti ymp\u00e4ri maailmaa l\u00f6yt\u00e4en uusia maailmoja \u2014 mutta \u00e4l\u00e4 anna kenenk\u00e4\u00e4n v\u00e4itt\u00e4\u00e4, ett\u00e4 l\u00f6yt\u00f6retkien aikakausi olisi ohi. Maailmankaikkeus on valtava ja t\u00e4ynn\u00e4 paljastettavia mysteerej\u00e4, kuten komeetta 67P\/Churylov-Gerasimenkon maailma, jota Rosetta-avaruusluotain parhaillaan tutkii.<\/p>\n<\/div>\n

Saavuttuaan komeetan luo viime vuoden elokuussa Rosetta on tutkinut yli kaksi kolmasosaa komeetan pinnasta, ja se on osoittautunut odotettua mielenkiintoisemmaksi. Maisema on j\u00e4nnitt\u00e4v\u00e4 sekoitus: jotkut alueet ovat paksun p\u00f6lyn peitossa, kun taas toisilla alueilla on kallioisia jyrk\u00e4nteit\u00e4 ja kanjoneita. Joillakin alueilla on valtavia kaivantoja, kuoppia ja lohkareita tai sileit\u00e4 aavikoita.<\/p>\n

Monet Rosettan jyrkist\u00e4 kallioista ovat t\u00e4ynn\u00e4 vaarallisilta n\u00e4ytt\u00e4vi\u00e4 halkeamia. Suurin halkeama on 500 metri\u00e4 pitk\u00e4 \u2013 se on kuin viisi jalkapallokentt\u00e4\u00e4!<\/p>\n

Toinen mielenkiintoinen ilmi\u00f6 ovat suihkut, joiden on havaittu nousevan komeetan pinnalle hajallaan olevista kuopista. N\u00e4ist\u00e4 suihkuista purkautuva kaasu toimii hieman kuten tuuli Maassa ja siirtelee p\u00f6ly\u00e4 pinnalla. T\u00e4m\u00e4 aiheuttaa toisinaan pinnalle aaltoilua, jollaisia voi joskus n\u00e4hd\u00e4 rannalla, kun vuorovesi vet\u00e4ytyy.<\/p>\n

Niiden muutaman kuukauden aikana, jotka Rosetta on kulkenut komeetan rinnalla, olemme jo oppineet valtavasti. Kun Rosetta ker\u00e4\u00e4 ensi vuoden aikana yh\u00e4 enemm\u00e4n tietoa, tutkijat ovat varmoja, ett\u00e4 he pystyv\u00e4t vihdoin vastaamaan joihinkin t\u00e4rkeisiin kysymyksiin aurinkokuntamme syntym\u00e4st\u00e4!<\/p>\n

Mielenkiintoinen fakta:<\/b> P\u00e4iv\u00e4 Rosettan komeetalla on puolet maapallon p\u00e4iv\u00e4n pituudesta, eli vain 12 tuntia. Sen kiertorata Auringon ymp\u00e4ri kest\u00e4\u00e4 kuitenkin kuusi kertaa kauemmin kuin maapallolla.<\/p>","protected":false},"excerpt":{"rendered":"

It\u2019s been hundreds of years since Christopher Columbus sailed the Earth discovering new worlds \u2014 but don\u2019t let anyone tell you that the Age of Exploration is over. The Universe […]<\/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\/2015\/01\/comet_from_8_km2\/17887284-2-eng-GB\/Comet_from_8_km.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2015\/01\/Comet_from_8_km2","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-545","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\/545","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=545"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/545\/revisions"}],"predecessor-version":[{"id":1688,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/545\/revisions\/1688"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=545"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=545"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=545"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=545"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=545"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=545"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=545"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=545"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}