{"id":20,"date":"2009-02-04T08:56:00","date_gmt":"2009-02-04T07:56:00","guid":{"rendered":"https:\/\/kids.esa.int\/cheops_exoplanets\/"},"modified":"2026-10-08T00:23:07","modified_gmt":"2026-10-07T22:23:07","slug":"cheops_exoplanets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/ro\/cheops_exoplanets\/","title":{"rendered":"Exoplanete"},"content":{"rendered":"<div class=\"lede\">\n<p>Acesta <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Our_Universe\/Planets_and_moons\/The_Solar_System_and_its_planets\" target=\"_blank\" rel=\"noopener\">Sistemul Solar<\/a> con\u021bine opt planete care orbiteaz\u0103 \u00een jurul stelei noastre, <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Our_Universe\/The_Sun\/Our_nearest_star\" target=\"_blank\" rel=\"noopener\">Soarele<\/a>. Dar \u0219tia\u021bi c\u0103 exist\u0103 mult, mult mai multe planete acolo, \u00een spa\u021biu, care orbiteaz\u0103 \u00een jurul <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Our_Universe\/Stars_and_galaxies\/Stars\" target=\"_blank\" rel=\"noopener\">stele<\/a> pe care le vedem noaptea? Acestea se numesc planete extrasolare sau, pe scurt, exoplanete.<\/p>\n<p>Descoperirea exoplanetelor este extrem de dificil\u0103. Acestea se afl\u0103 at\u00e2t de departe \u00eenc\u00e2t nu le putem vedea pur \u0219i simplu cu un telescop obi\u0219nuit. De asemenea, sunt foarte mici \u0219i slab luminoase \u00een compara\u021bie cu stelele \u00een jurul c\u0103rora orbiteaz\u0103. Asta \u00eenseamn\u0103 c\u0103 astronomii care caut\u0103 exoplanete trebuie s\u0103 foloseasc\u0103 ni\u0219te tehnici ingenioase!<\/p>\n<\/div>\n<p>Prima metod\u0103 folosit\u0103 de astronomi pentru a descoperi exoplanete se nume\u0219te \u201eviteza radial\u0103\u201d, dar are o denumire mai simpl\u0103: \u201eoscila\u021bia stelei\u201d! Pe m\u0103sur\u0103 ce o planet\u0103 orbiteaz\u0103 \u00een jurul unei stele, planeta <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Our_Universe\/Story_of_the_Universe\/Gravity\" target=\"_blank\" rel=\"noopener\">gravita\u021bie<\/a> trage de stea, d\u00e2nd impresia, din perspectiva noastr\u0103, c\u0103 aceasta se clatin\u0103 \u00een spa\u021biu. Efectul este mic, dar cu ajutorul unor instrumente foarte sensibile, este posibil s\u0103 se observe unele exoplanete care provoac\u0103 cl\u0103tinare stelelor lor!<\/p>\n<p>\u00cen prezent, metoda tranzitului este o tehnic\u0103 de detectare mai des utilizat\u0103. Atunci c\u00e2nd o exoplanet\u0103 trece \u00een fa\u021ba stelei sale, aceasta poate bloca o cantitate infim\u0103 din lumina stelei. Acest fenomen se nume\u0219te tranzit. Din perspectiva noastr\u0103 de pe P\u0103m\u00e2nt, steaua pare pu\u021bin mai slab\u0103 \u00een timpul tranzitului, iar apoi devine din nou mai str\u0103lucitoare odat\u0103 ce planeta nu mai blocheaz\u0103 lumina. Acesta este un indiciu c\u0103 ar putea exista o exoplanet\u0103! Tranzitele sunt dificil de detectat deoarece varia\u021bia intensit\u0103\u021bii luminoase este foarte mic\u0103, dar telescoapele speciale destinate c\u0103ut\u0103rii planetelor, precum cele ale ESA, <a href=\"https:\/\/sci.esa.int\/web\/corot\" target=\"_blank\" rel=\"noopener\">CoRoT<\/a> au avut un mare succes! ESA, 2019 <a href=\"https:\/\/sci.esa.int\/web\/cheops\" target=\"_blank\" rel=\"noopener\">CHEOPS<\/a> Misiunea utilizeaz\u0103, de asemenea, metoda de tranzit.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"2500\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2019\/02\/Transiting_exoplanet\" 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\/2019\/02\/transiting_exoplanet\/19220628-1-eng-GB\/Transiting_exoplanet.jpg\" alt=\"Transiting exoplanet\"><figcaption>Exoplanet\u0103 \u00een tranzit<\/figcaption><\/figure>\n<p>Astrometria este o alt\u0103 tehnic\u0103, care va fi utilizat\u0103 de ESA <a href=\"https:\/\/sci.esa.int\/web\/gaia\" target=\"_blank\" rel=\"noopener\">Gaia<\/a> misiune. Noaptea, putem observa stelele mi\u0219c\u00e2ndu-se pe traiectorii pe cerul nostru \u0219i le putem prezice pozi\u021biile cu o precizie extrem\u0103 pe parcursul a mul\u021bi ani. Dac\u0103 o stea are o planet\u0103, mi\u0219carea ei va fi u\u0219or diferit\u0103 fa\u021b\u0103 de cea preconizat\u0103 \u2013 doar o diferen\u021b\u0103 infim\u0103, dar suficient\u0103 pentru ca Gaia s\u0103 o poat\u0103 detecta!<\/p>\n<p>Acestea sunt principalele metode de detectare a planetelor extrasolare, de\u0219i exist\u0103 \u0219i altele. Uneori este chiar posibil s\u0103 se foloseasc\u0103 observatoare profesionale pentru a realiza fotografii \u2013 de\u0219i aceste imagini par foarte rudimentare \u00een compara\u021bie cu fotografiile pe care le putem face planetelor din apropiere, din propriul nostru Sistem Solar.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"4042\" data-credit=\"ESA \u2013 SJM Photography\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2019\/10\/Children_imagine_exoplanets\" 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\/2019\/10\/children_imagine_exoplanets\/20819272-1-eng-GB\/Children_imagine_exoplanets.jpg\" alt=\"Children imagine exoplanets\"><figcaption>Copiii \u00ee\u0219i imagineaz\u0103 exoplanete<\/figcaption><\/figure>\n<p>P\u00e2n\u0103 \u00een prezent, folosind toate aceste tehnici, au fost descoperite mii de planete extrasolare, iar num\u0103rul lor cre\u0219te \u00een continuu. Ar putea vreuna dintre acestea s\u0103 g\u0103zduiasc\u0103 via\u021b\u0103? Poate chiar <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Life_in_Space\/Are_we_alone\/Are_we_alone\" target=\"_blank\" rel=\"noopener\">fiin\u021be inteligente<\/a> V\u0103 place? Ce p\u0103rere ave\u021bi?<\/p>\n<p>Este cu siguran\u021b\u0103 o perioad\u0103 foarte interesant\u0103 pentru cei pasiona\u021bi de exoplanete!<\/p>","protected":false},"excerpt":{"rendered":"<p>The Solar System contains eight planets orbiting our local star, the Sun. But did you know that there are many, many more planets out there in space, orbiting the stars [&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\/2019\/09\/hubble_finds_water_vapor_on_habitable-zone_exoplanet_for_the_first_time\/19700242-1-eng-GB\/Hubble_Finds_Water_Vapor_on_Habitable-Zone_Exoplanet_for_the_First_Time.jpg","esa_banner_description":"We do not yet have the technology to take detailed photos of exoplanets, but an artist created this picture of what one may look like. Copyright: ESA\/Hubble, M. Kornmesser","esa_banner_credit":"ESA\/Hubble, M. Kornmesser","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2019\/09\/Hubble_finds_water_vapor_on_habitable-zone_exoplanet_for_the_first_time","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":[14,10,13],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-20","post","type-post","status-publish","format-standard","hentry","category-are-we-alone","category-learn","category-life-in-space"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/20","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/comments?post=20"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/20\/revisions"}],"predecessor-version":[{"id":4261,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/20\/revisions\/4261"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/media?parent=20"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/categories?post=20"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/tags?post=20"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/panel?post=20"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/language?post=20"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/age?post=20"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/duration?post=20"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/resource_type?post=20"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/audience?post=20"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/wf_post_folders?post=20"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}