{"id":705,"date":"2012-10-29T08:57:00","date_gmt":"2012-10-29T07:57:00","guid":{"rendered":"https:\/\/kids.esa.int\/new_satellite_to_study_alien_planets\/"},"modified":"2026-10-08T00:31:20","modified_gmt":"2026-10-07T22:31:20","slug":"new_satellite_to_study_alien_planets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/new_satellite_to_study_alien_planets\/","title":{"rendered":"Uusi satelliitti vieraiden planeettojen tutkimiseen"},"content":{"rendered":"<div class=\"lede\">\n<p>Maasta k\u00e4sin voimme toisinaan n\u00e4hd\u00e4 Venuksen ja Merkuriuksen mustina pistein\u00e4, jotka kulkevat Auringon edess\u00e4. T\u00e4llaisissa ilmi\u00f6iss\u00e4 \u2013 joita kutsutaan kauttakulkuiksi \u2013 planeetta peitt\u00e4\u00e4 pienen osan valosta, jolloin Aurinko n\u00e4ytt\u00e4\u00e4 hieman himme\u00e4mm\u00e4lt\u00e4. Samanlaisia himmenemisi\u00e4 voivat aiheuttaa eksoplaneetat \u2013 planeetat, jotka kiert\u00e4v\u00e4t kaukaisempia t\u00e4hti\u00e4. Nyt ESA on p\u00e4\u00e4tt\u00e4nyt kehitt\u00e4\u00e4 uuden tieteellisen avaruuslennon n\u00e4iden kauttakulkujen etsimiseksi.<\/p>\n<\/div>\n<p>CHEOPS-nimisen (lyhenne sanoista CHaracterising ExOPlanets Satellite) avaruusluotaimen laukaisun on tarkoitus tapahtua vuonna 2017. Se kohdistuu kirkkaisiin, l\u00e4hell\u00e4 sijaitseviin t\u00e4htiin, joiden tiedet\u00e4\u00e4n jo kiert\u00e4v\u00e4n joitakin planeettoja. Avaruusluotain seuraa kunkin t\u00e4hden kirkkautta eritt\u00e4in tarkasti etsien merkkej\u00e4 planeetan ohikulusta.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"537\" data-credit=\"CNES\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2012\/10\/Planet_transit_in_front_of_a_star2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2012\/10\/planet_transit_in_front_of_a_star2\/17868969-2-eng-GB\/Planet_transit_in_front_of_a_star.jpg\" alt=\"Planet transit in front of a star\"><figcaption>Planeetan kulku t\u00e4hden edess\u00e4<\/figcaption><\/figure>\n<p>Saapuvan t\u00e4htivalon muutosten yksityiskohtainen analyysi mahdollistaa kunkin ohikulkevan planeetan halkaisijan mittaamisen eritt\u00e4in tarkasti. Niiden planeettojen osalta, joiden massa on tiedossa, on mahdollista laskea niiden tiheys, mik\u00e4 antaa vihjeit\u00e4 niiden sis\u00e4isest\u00e4 rakenteesta.<\/p>\n<p>Tieto eksoplaneettojen koosta ja massasta auttaa tutkijoita ymm\u00e4rt\u00e4m\u00e4\u00e4n planeettojen muodostumista planeetoista, joiden massa on muutaman kerran Maan massa \u2013 niin sanotuista \u2019supermaista\u2018 \u2013 aina Neptunuksen kokoisiin maailmoihin asti. Sen avulla voidaan my\u00f6s tunnistaa planeetat, joilla on huomattavan paksu ilmakeh\u00e4 ja jotka ovat ihanteellisia kohteita seuraavan sukupolven teleskooppien tekemille yksityiskohtaisemmille tutkimuksille. N\u00e4it\u00e4 ovat muun muassa maassa sijaitseva European Extremely Large Telescope (E-ELT) ja James Webb -avaruusteleskooppi.<\/p>\n<p>CHEOPS-satelliittia kehitt\u00e4v\u00e4t ESA ja Sveitsi, ja hankkeeseen osallistuu my\u00f6s joitakin muita ESA:n j\u00e4senvaltioita. Satelliitti kiert\u00e4\u00e4 l\u00e4hes polaarisella kiertoradalla noin 800 km:n korkeudella maanpinnasta, ja sen toiminta-aika on 3 \u00bd vuotta.<\/p>","protected":false},"excerpt":{"rendered":"<p>From Earth, we can sometimes see Venus and Mercury as black spots passing across the Sun. During such events \u2013 called transits &#8211; the planet blocks a tiny amount of [&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\/2012\/10\/artist_impression_of_cheops2\/17900088-2-eng-GB\/Artist_impression_of_Cheops.jpg","esa_banner_description":"Artist impression of Cheops","esa_banner_credit":"University of Bern","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2012\/10\/Artist_impression_of_Cheops2","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-705","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\/705","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=705"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/705\/revisions"}],"predecessor-version":[{"id":4640,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/705\/revisions\/4640"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=705"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=705"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=705"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=705"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=705"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=705"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=705"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}