{"id":963,"date":"2006-01-19T11:13:00","date_gmt":"2006-01-19T10:13:00","guid":{"rendered":"https:\/\/kids.esa.int\/mercury\/"},"modified":"2026-10-08T00:34:16","modified_gmt":"2026-10-07T22:34:16","slug":"mercury","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/mercury\/","title":{"rendered":"Elohopea"},"content":{"rendered":"
\n

Merkurius on Auringosta l\u00e4hinn\u00e4 oleva planeetta. Sit\u00e4 ei ole kovin helppo havaita, koska se sijaitsee taivaalla aina l\u00e4hell\u00e4 Aurinkoa. Jopa suotuisimmassa asennossaan se on l\u00e4hell\u00e4 horisonttia ja n\u00e4kyviss\u00e4 vain muutaman tunnin ajan auringonlaskun j\u00e4lkeen tai auringonnousun ennen.<\/p>\n<\/div>\n

Jumalten siivek\u00e4s sanansaattaja on antanut nimens\u00e4 t\u00e4lle planeetalle, joka kiert\u00e4\u00e4 Aurinkoa kerran 88 p\u00e4iv\u00e4ss\u00e4. Se py\u00f6rii kuitenkin akselinsa ymp\u00e4ri hyvin hitaasti \u2013 kerran 58,6 p\u00e4iv\u00e4ss\u00e4. T\u00e4m\u00e4 on t\u00e4sm\u00e4lleen kaksi kolmasosaa sen kiertoajasta.<\/p>\n

Merkurius on pieni, kivinen planeetta. Sen halkaisija on vain noin yht\u00e4 suuri kuin Atlantin valtameren leveys, ja 18 Merkuriusta mahtuisi Maan sis\u00e4\u00e4n.<\/p>\n

Merkurius muistuttaa hyvin paljon Kuuta. Sen pinta on t\u00e4ynn\u00e4 t\u00f6rm\u00e4yskraattereita. Sill\u00e4 ei ole ilmakeh\u00e4\u00e4 eik\u00e4 vett\u00e4. P\u00e4iv\u00e4n keskip\u00e4iv\u00e4n l\u00e4mp\u00f6tila p\u00e4iv\u00e4ntasaajalla voi nousta jopa 450 \u00b0C:een, mutta y\u00f6t ovat eritt\u00e4in kylmi\u00e4, alle -180 \u00b0C. Napojen l\u00e4hell\u00e4 sijaitsevissa syviss\u00e4, pimeiss\u00e4 kraattereissa saattaa olla jonkin verran vesij\u00e4\u00e4t\u00e4.<\/p>\n

Merkurius on yll\u00e4tt\u00e4v\u00e4n tihe\u00e4. Sen uskotaan sis\u00e4lt\u00e4v\u00e4n suuren rautaytimen, joka t\u00e4ytt\u00e4\u00e4 suurimman osan Merkuriuksen sis\u00e4osista. Sill\u00e4 on my\u00f6s yll\u00e4tt\u00e4v\u00e4n voimakas magneettikentt\u00e4.<\/p>\n

T\u00e4h\u00e4n menness\u00e4 Mariner 10 -avaruusluotain on kuvannut alle puolet planeetan pinnasta l\u00e4hiet\u00e4isyydelt\u00e4. ESA ja Japani suunnittelevat l\u00e4hett\u00e4v\u00e4ns\u00e4 kaksi kiertoradalla liikkuvaa avaruusluotainta Merkuriukseen vuonna 2013. BepiColombo-missio on nimetty kuuluisan italialaisen matemaatikon ja tiedemiehen mukaan.<\/p>","protected":false},"excerpt":{"rendered":"

Mercury is the first planet from the Sun. It is not very easy to observe since it is always close to the Sun in the sky. Even when best placed, […]<\/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\/2006\/01\/mercury_s_southern_hemisphere2\/17904638-2-eng-GB\/Mercury_s_Southern_Hemisphere.jpg","esa_banner_description":"","esa_banner_credit":"JPL","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2006\/01\/Mercury_s_Southern_Hemisphere2","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":[10,11,12],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-963","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/963","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=963"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/963\/revisions"}],"predecessor-version":[{"id":2106,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/963\/revisions\/2106"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=963"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=963"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=963"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=963"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=963"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=963"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=963"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=963"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=963"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}