{"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\/da\/new_satellite_to_study_alien_planets\/","title":{"rendered":"Ny satellit til unders\u00f8gelse af fremmede planeter"},"content":{"rendered":"
\n

Fra Jorden kan vi nogle gange se Venus og Merkur som sorte pletter, der passerer foran Solen. Under s\u00e5danne begivenheder \u2013 kaldet transit \u2013 blokerer planeten en ganske lille m\u00e6ngde lys, hvilket f\u00e5r Solen til at virke en smule svagere. Lignende lysd\u00e6mpninger kan for\u00e5rsages af exoplaneter \u2013 verdener, der kredser om mere fjerne stjerner. Nu har ESA besluttet at udvikle en ny videnskabelig mission med det form\u00e5l at s\u00f8ge efter disse transitter.<\/p>\n<\/div>\n

Missionen, der g\u00e5r under navnet CHEOPS (en forkortelse for CHaracterising ExOPlanets Satellite), forventes at blive opsendt i 2017. Den vil fokusere p\u00e5 lyse, n\u00e6rliggende stjerner, som man allerede ved har planeter i kredsl\u00f8b omkring sig. Rumfart\u00f8jet vil overv\u00e5ge hver stjernes lysstyrke med h\u00f8j pr\u00e6cision og lede efter de karakteristiske tegn p\u00e5 en transit.<\/p>\n

\"Planet
En planet passerer foran en stjerne<\/figcaption><\/figure>\n

En detaljeret analyse af \u00e6ndringerne i det indkommende stjernelys vil g\u00f8re det muligt at m\u00e5le diameteren p\u00e5 hver enkelt planet, der passerer foran stjernen, med stor n\u00f8jagtighed. For de planeter, hvor massen er kendt, vil det v\u00e6re muligt at beregne deres massefylde, hvilket vil give en indikation af deres indre struktur.<\/p>\n

Viden om exoplaneternes st\u00f8rrelse og masse vil hj\u00e6lpe forskerne med at forst\u00e5 dannelsen af planeter, der sp\u00e6nder fra planeter med en masse p\u00e5 et par gange Jordens \u2013 s\u00e5kaldte \u2019superjord\u2018 \u2013 til verdener p\u00e5 st\u00f8rrelse med Neptun. Det vil ogs\u00e5 g\u00f8re det muligt at identificere planeter med betydelige atmosf\u00e6rer, som vil v\u00e6re ideelle m\u00e5l for mere detaljerede unders\u00f8gelser med den n\u00e6ste generation af teleskoper. Heriblandt er det jordbaserede European Extremely Large Telescope og James Webb-rumteleskopet.<\/p>\n

CHEOPS udvikles af ESA og Schweiz, og en r\u00e6kke andre ESA-medlemsstater deltager ligeledes. Satellitten vil kredse i en n\u00e6sten pol\u00e6r bane, ca. 800 km over Jorden, og v\u00e6re i drift i 3\u00bd \u00e5r.<\/p>","protected":false},"excerpt":{"rendered":"

From Earth, we can sometimes see Venus and Mercury as black spots passing across the Sun. During such events \u2013 called transits – the planet blocks a tiny amount of […]<\/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\/da\/wp-json\/wp\/v2\/posts\/705","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=705"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/705\/revisions"}],"predecessor-version":[{"id":4640,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/705\/revisions\/4640"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=705"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=705"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=705"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=705"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=705"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=705"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=705"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}