{"id":1127,"date":"2004-11-15T12:50:00","date_gmt":"2004-11-15T11:50:00","guid":{"rendered":"https:\/\/kids.esa.int\/the_sun\/"},"modified":"2026-10-08T00:36:18","modified_gmt":"2026-10-07T22:36:18","slug":"the_sun","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/the_sun\/","title":{"rendered":"The Sun"},"content":{"rendered":"
\n

Spektrografeiksi kutsutut erikoislaitteet paljastavat, ett\u00e4 Aurinko koostuu l\u00e4hes kokonaan kahdesta kaasusta: vedyst\u00e4 ja heliumista. Sen pinnan l\u00e4mp\u00f6tila on noin 5 500 astetta \u2013 yli 20 kertaa kuumempi kuin uunin maksimil\u00e4mp\u00f6tila. Keskiosassa l\u00e4mp\u00f6tila nousee noin 15 miljoonaan asteeseen, ja kaasun tiheys on noin kymmenkertainen lyijyn tiheyteen verrattuna.<\/p>\n<\/div>\n

N\u00e4in korkeissa l\u00e4mp\u00f6tiloissa ja paineissa Aurinkosta tulee ydinreaktori, jossa vety muuttuu heliumiksi. Samalla syntyy valtavia m\u00e4\u00e4ri\u00e4 s\u00e4teily\u00e4. T\u00e4m\u00e4 s\u00e4teily p\u00e4\u00e4see pinnalle n\u00e4kyv\u00e4n\u00e4 valona, infrapuna- ja ultraviolettivalona sek\u00e4 r\u00f6ntgens\u00e4tein\u00e4.<\/p>\n

Joka tunti Aurinko heitt\u00e4\u00e4 avaruuteen miljardi tonnia kaasua jopa 2 miljoonan kilometrin tuntinopeudella. Siit\u00e4 huolimatta Aurinko on niin massiivinen, ett\u00e4 se voi jatkaa palamistaan miljardeja vuosia.<\/p>\n

\"Mysterious<\/figure>\n

Auringon aktiivisuus kasvaa 11 vuoden v\u00e4lein. T\u00e4ll\u00f6in sen pinnalla olevien tummien auringonpilkkujen m\u00e4\u00e4r\u00e4 kasvaa. Auringonpilkkusyklin huipulla esiintyy huomattavasti enemm\u00e4n r\u00e4j\u00e4hdysm\u00e4isi\u00e4 aurinkomyrskyj\u00e4. Viimeisimm\u00e4n aurinkomaksimin aikana vuonna 2001 lukuisat aurinkopurkaukset ja koronan massapurkaukset sinkosivat miljardeja tonneja ainetta avaruuteen suurella nopeudella.<\/p>\n

Jos n\u00e4m\u00e4 myrskyt suuntaavat kohti Maata, niill\u00e4 voi olla vakavia seurauksia. Ne voivat aiheuttaa s\u00e4hk\u00f6katkoja, vahingoittaa satelliitteja sek\u00e4 h\u00e4irit\u00e4 viestint\u00e4- ja navigointij\u00e4rjestelmi\u00e4. Ne aiheuttavat my\u00f6s Maan revontulet \u2013 jotka tunnetaan yleisesti nimill\u00e4 pohjois- ja etel\u00e4nvalot.<\/p>","protected":false},"excerpt":{"rendered":"

Special instruments known as spectrographs tell us that the Sun is made almost entirely of two gases, hydrogen and helium. The temperature at its surface is about 5 500 degrees […]<\/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\/2004\/11\/the_sun2\/17874148-2-eng-GB\/The_Sun.jpg","esa_banner_description":"The Sun","esa_banner_credit":"SOHO\/EIT (ESA & NASA)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/11\/The_Sun2","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":[10,11,35],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1127","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-the-sun","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1127","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=1127"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1127\/revisions"}],"predecessor-version":[{"id":4862,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1127\/revisions\/4862"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1127"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1127"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1127"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1127"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1127"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1127"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1127"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}