{"id":604,"date":"2013-12-19T09:40:00","date_gmt":"2013-12-19T08:40:00","guid":{"rendered":"https:\/\/kids.esa.int\/liftoff_for_gaia\/"},"modified":"2026-10-08T00:30:10","modified_gmt":"2026-10-07T22:30:10","slug":"liftoff_for_gaia","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/liftoff_for_gaia\/","title":{"rendered":"Gaian laukaisu"},"content":{"rendered":"
\n

ESAn Gaia-luotain laukaistiin t\u00e4n\u00e4 aamuna Sojuz-raketilla Euroopan avaruuskeskuksesta Kouroussa, Ranskan Guayanassa, j\u00e4nnitt\u00e4v\u00e4lle matkalleen tutkimaan miljardia aurinkoa.<\/p>\n<\/div>\n

Gaia laatii t\u00e4h\u00e4n menness\u00e4 tarkimman kartan Linnunradasta. Mittaamalla tarkasti miljardin t\u00e4hden sijainnit ja liikkeet se antaa vastauksia galaksimme alkuper\u00e4\u00e4 ja kehityst\u00e4 koskeviin kysymyksiin.<\/p>\n

Gaia on nyt matkalla kohti kiertorataa, joka kiert\u00e4\u00e4 avaruudessa sijaitsevaa virtuaalista pistett\u00e4 nimelt\u00e4 L2, joka sijaitsee noin 1,5 miljoonaa kilometri\u00e4 Maasta kauempana, kun katsotaan Auringosta k\u00e4sin.<\/p>\n

\"Gaia\"
Gaia<\/figcaption><\/figure>\n

Gaia tarkkailee taivasta toistuvasti ja havainnoi jokaisen miljardista t\u00e4hdest\u00e4 keskim\u00e4\u00e4rin 70 kertaa viiden vuoden aikana. Se mittaa kunkin t\u00e4hden sijainnin ja keskeiset fysikaaliset ominaisuudet, kuten kirkkauden, l\u00e4mp\u00f6tilan ja kemiallisen koostumuksen.<\/p>\n

T\u00e4htien liikkeit\u00e4 voidaan \u2018kelata taaksep\u00e4in\u2019, jotta voimme oppia lis\u00e4\u00e4 niiden alkuper\u00e4st\u00e4 ja siit\u00e4, miten Linnunrata on muodostunut miljardien vuosien aikana pienempien galaksien sulautuessa yhteen, sek\u00e4 \u2018kelata eteenp\u00e4in\u2019, jotta voimme oppia lis\u00e4\u00e4 sen lopullisesta kohtalosta.<\/p>\n

Vertaamalla toistuvia taivaskartoituksiaan Gaia tulee my\u00f6s l\u00f6yt\u00e4m\u00e4\u00e4n kymmeni\u00e4 tuhansia supernovia, jotka ovat t\u00e4htien kuolemanhuutoja niiden saavuttaessa el\u00e4m\u00e4ns\u00e4 lopun ja r\u00e4j\u00e4ht\u00e4ess\u00e4. Joidenkin t\u00e4htien sijainnissa esiintyv\u00e4t pienet jaksolliset heilahtelut paljastavat todenn\u00e4k\u00f6isesti niiden kiertoradalla olevien planeettojen olemassaolon, sill\u00e4 planeetat vet\u00e4v\u00e4t t\u00e4hti\u00e4 puolelta toiselle.<\/p>\n

Gaia tulee my\u00f6s l\u00f6yt\u00e4m\u00e4\u00e4n uusia asteroideja aurinkokunnastamme ja tarkentamaan jo tunnettujen asteroidejen kiertoratoja sek\u00e4 suorittamaan tarkkoja testej\u00e4 Einsteinin kuuluisalle yleiselle suhteellisuusteorialle.<\/p>","protected":false},"excerpt":{"rendered":"

ESA\u2019s Gaia mission blasted off this morning on a Soyuz rocket from Europe\u2019s Spaceport in Kourou, French Guiana, on its exciting mission to study a billion suns. Gaia will create […]<\/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\/2013\/12\/gaia3_h\/17875111-2-eng-GB\/Gaia3_H.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\/2013\/12\/Gaia3_H","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":[10,11,21],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-604","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-stars-and-galaxies"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/604","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=604"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/604\/revisions"}],"predecessor-version":[{"id":4575,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/604\/revisions\/4575"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=604"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=604"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=604"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=604"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=604"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=604"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=604"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}