{"id":572,"date":"2004-11-16T10:16:00","date_gmt":"2004-11-16T09:16:00","guid":{"rendered":"https:\/\/kids.esa.int\/comets_and_meteors_rosetta\/"},"modified":"2026-10-08T00:29:47","modified_gmt":"2026-10-07T22:29:47","slug":"comets_and_meteors_rosetta","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/comets_and_meteors_rosetta\/","title":{"rendered":"Rosetta"},"content":{"rendered":"
\n

Maaliskuussa 1986 ESA:n Giotto-avaruusluotain lensi 600 km:n p\u00e4\u00e4h\u00e4n Halleyn komeetan ytimest\u00e4. Se l\u00e4hetti ensimm\u00e4iset l\u00e4hikuvat komeetan j\u00e4isest\u00e4 ytimest\u00e4. Nyt toinen ESA:n avaruusluotain, Rosetta, on matkalla kohti komeettaa. Rosetta on Euroopan kaikkien aikojen monimutkaisin avaruuslento.<\/p>\n<\/div>\n

3 tonnin painoinen avaruusalus kuljettaa mukanaan 11 kokeilulaitetta ja laskeutumisaluksen, jossa on viel\u00e4 9 kokeilulaitetta. Sen energianl\u00e4hteen\u00e4 toimivat kaksi valtavaa aurinkopaneelia, joista kumpikin on 14 metri\u00e4 pitk\u00e4.<\/p>\n

2. maaliskuuta 2004 laukaistu Rosetta saavuttaa Churyumov-Gerasimenko-komeetan 10 vuoden kuluttua. Kiertoreitti sis\u00e4lt\u00e4\u00e4 kolme ohilentoa Maan ohi ja yhden Marsin ohi. Rosetta suuntaa my\u00f6s Marsin ja Jupiterin v\u00e4liseen p\u00e4\u00e4asteroidivy\u00f6hykkeeseen ja poistuu sielt\u00e4. N\u00e4in se voi ottaa l\u00e4hikuvia kahdesta asteroidista, Steinsist\u00e4 ja Lutetiaista.<\/p>\n

Saapuessaan komeetan l\u00e4helle Rosetta hidastaa vauhtiaan ja muuttaa lentorataansa siten, ett\u00e4 se siirtyy kiertoradalle vain muutaman kilometrin korkeudelle kiinte\u00e4n ytimen yl\u00e4puolelle.<\/p>\n

Kun komeetta on kartoitettu, Rosetta irrottaa laskeutumisaluksensa (nimelt\u00e4\u00e4n Philae). Se kiinnittyy komeetan ytimeen ja l\u00e4hett\u00e4\u00e4 ensimm\u00e4iset kuvat komeetan pinnalta.<\/p>\n

\"Rosetta<\/figure>\n

Ylh\u00e4\u00e4ll\u00e4 kiertolainen seuraa komeettaa, kun se kiit\u00e4\u00e4 kohti aurinkokunnan sis\u00e4osaa. T\u00e4m\u00e4n 18 kuukautta kest\u00e4v\u00e4n takaa-ajon aikana komeetan j\u00e4\u00e4muodostumat muuttuvat kaasuksi, jolloin avaruuteen sinkoaa ainevirtoja. Rosetta n\u00e4ytt\u00e4\u00e4 meille ensimm\u00e4ist\u00e4 kertaa ne dramaattiset muutokset, joita tapahtuu, kun aurinko l\u00e4mmitt\u00e4\u00e4 t\u00e4t\u00e4 avaruuden j\u00e4\u00e4vuorta.<\/p>","protected":false},"excerpt":{"rendered":"

In March 1986, ESA’s Giotto spacecraft flew to within 600 km of comet Halley’s nucleus. It sent back the first close-up pictures of a comet’s icy heart. Now, another ESA […]<\/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\/2014\/09\/rosetta_and_philae_at_comet3\/17897495-2-eng-GB\/Rosetta_and_Philae_at_comet.jpg","esa_banner_description":"Rosetta and Philae at comet","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2014\/09\/Rosetta_and_Philae_at_comet3","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":[46,10,11],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-572","post","type-post","status-publish","format-standard","hentry","category-comets-and-meteors","category-learn","category-our-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/572","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=572"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/572\/revisions"}],"predecessor-version":[{"id":4553,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/572\/revisions\/4553"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=572"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=572"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=572"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=572"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=572"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=572"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=572"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=572"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=572"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=572"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}