{"id":821,"date":"2004-12-02T15:40:00","date_gmt":"2004-12-02T14:40:00","guid":{"rendered":"https:\/\/kids.esa.int\/beyond_earth\/"},"modified":"2026-10-08T00:32:39","modified_gmt":"2026-10-07T22:32:39","slug":"beyond_earth","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/beyond_earth\/","title":{"rendered":"Maapallon ulkopuolella"},"content":{"rendered":"<div class=\"lede\">\n<p>Suurin osa avaruusaluksista sijoitetaan kiertoradalle Maan ymp\u00e4rille. T\u00e4m\u00e4 ei kuitenkaan aina ole paras sijainti kaukaista avaruuden osia tutkiville tieteellisille satelliiteille.<\/p>\n<\/div>\n<p>Hubble-avaruusteleskooppi kiert\u00e4\u00e4 py\u00f6re\u00e4ll\u00e4 kiertoradalla 600 km:n korkeudella maanpinnasta, ja sen kiertoradan kaltevuus p\u00e4iv\u00e4ntasaajaan n\u00e4hden on 28,5 astetta. T\u00e4m\u00e4 maankiertorata helpottaa observatorion korjaus- ja huoltot\u00f6it\u00e4. Maa ja Kuu peitt\u00e4v\u00e4t kuitenkin suuren osan taivaasta.<\/p>\n<p>Hubblen seuraaja, James Webb -avaruusteleskooppi, tulee toimimaan huomattavasti kauempana. Se sijoitetaan vakaalle kiertoradalle niin sanotulle L2-Lagrange-pisteelle, joka sijaitsee 1,5 miljoonan kilometrin p\u00e4\u00e4ss\u00e4 Maan pime\u00e4ll\u00e4 puolella.<\/p>\n<p>L2 on yksi Maan viidest\u00e4 Lagrange-pisteest\u00e4. N\u00e4iss\u00e4 pisteiss\u00e4 Maan, Kuun ja Auringon vetovoimat kumoavat toisensa, joten satelliitin pit\u00e4minen samassa asemassa on helppoa.<\/p>\n<p>Muut satelliitit, kuten ESA:n SOHO-observatorio, joutuvat tarkkailemaan Aurinkoa jatkuvasti. T\u00e4m\u00e4 avaruusalus sijaitsee L1-Lagrange-pisteess\u00e4, 1,5 miljoonaa kilometri\u00e4 Maasta Aurinkoa kohti.<\/p>\n<p>Koska Maan ja Auringon painovoimat ovat tasapainossa L1-pisteess\u00e4, SOHO voi pysy\u00e4 niiden v\u00e4liss\u00e4 koko ajan kuluttamatta juurikaan polttoainetta.<\/p>","protected":false},"excerpt":{"rendered":"<p>Most spacecraft are placed in orbits around the Earth. But this is not always the optimal place for scientific satellites that explore the distant universe. The Hubble Space Telescope follows [&hellip;]<\/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\/2003\/05\/changing_seasons_on_saturn2\/17877220-2-eng-GB\/Changing_seasons_on_Saturn.jpg","esa_banner_description":"Changing seasons on Saturn","esa_banner_credit":"NASA and The Hubble Heritage Team (STScI\/AURA)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/05\/Changing_seasons_on_Saturn2","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":[10,65,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-821","post","type-post","status-publish","format-standard","hentry","category-learn","category-mission-control","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/821","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=821"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/821\/revisions"}],"predecessor-version":[{"id":1964,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/821\/revisions\/1964"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=821"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=821"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=821"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=821"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=821"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=821"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=821"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=821"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=821"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=821"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}