{"id":832,"date":"2004-12-02T15:30:00","date_gmt":"2004-12-02T14:30:00","guid":{"rendered":"https:\/\/kids.esa.int\/many_parts\/"},"modified":"2026-10-08T00:32:47","modified_gmt":"2026-10-07T22:32:47","slug":"many_parts","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/many_parts\/","title":{"rendered":"Monet osat"},"content":{"rendered":"
\n

Autolla, josta puuttuvat py\u00f6r\u00e4t tai moottori, ei ole juurikaan arvoa. Samalla tavalla satelliittiin on asennettava tiettyj\u00e4 osia.<\/p>\n<\/div>\n

Useimpien avaruusalusten virransy\u00f6tt\u00f6 perustuu akkuihin ja aurinkokennoihin. Aurinkokennot ovat kiekkomaisia piikappaleita tai muista materiaaleista valmistettuja osia, jotka tuottavat s\u00e4hk\u00f6\u00e4, kun auringonvalo osuu niihin.<\/p>\n

Jos tuhansia t\u00e4llaisia kennoja yhdistet\u00e4\u00e4n suuriksi paneeleiksi aurinkopaneeleiksi, ne voivat tuottaa virtaa huomattavan kokoiselle avaruusalukselle. Kennot lataavat my\u00f6s akkuja aina, kun ne ovat auringonvalossa. Kun avaruusalus siirtyy varjoon, akut ottavat virransy\u00f6t\u00f6n hoitaakseen.<\/p>\n

Avaruusaluksissa on useita antenneja. Ne toimivat kuin korvat ja mahdollistavat yhteydenpidon Maahan. T\u00e4rkein n\u00e4ist\u00e4 on halkaisijaltaan jopa 2 metrin suuruinen lautasantennin, jolla voidaan l\u00e4hett\u00e4\u00e4 ja vastaanottaa suuria m\u00e4\u00e4ri\u00e4 dataa ja tietoa.<\/p>\n

Avaruusaluksen aivot ovat sen tietokonej\u00e4rjestelm\u00e4. Tiedot voidaan tallentaa tietokoneen muistiin tai l\u00e4hett\u00e4\u00e4 reaaliajassa takaisin Maahan antennien kautta.<\/p>\n

Tietokoneeseen on tallennettu my\u00f6s ohjeet avaruusaluksen k\u00e4yt\u00f6st\u00e4. T\u00e4m\u00e4 toimii varaj\u00e4rjestelm\u00e4n\u00e4 silt\u00e4 varalta, ett\u00e4 yhteys katkeaa tai laitteessa ilmenee vika.<\/p>\n

Avaruusalukset tarvitsevat my\u00f6s pieni\u00e4 moottoreita avaruudessa liikkumiseen. Moottoreita on erilaisia.<\/p>\n

Avaruusalukset k\u00e4\u00e4ntyv\u00e4t ja py\u00f6riv\u00e4t sytytt\u00e4m\u00e4ll\u00e4 ohjausraketteja. Ne ty\u00f6nt\u00e4v\u00e4t kuumia kaasuja avaruuteen suurella nopeudella. Joissakin satelliiteissa on ionimoottoreita. Ne k\u00e4ytt\u00e4v\u00e4t voimakasta s\u00e4hk\u00f6kentt\u00e4\u00e4 kaasun ty\u00f6nt\u00e4miseen avaruuteen.<\/p>","protected":false},"excerpt":{"rendered":"

A car without wheels or an engine is of little value. In the same way, there are certain parts that must be built into a satellite. Most spacecraft depend on […]<\/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\/2001\/01\/iss2\/17866379-3-eng-GB\/ISS.jpg","esa_banner_description":"ISS","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2001\/01\/ISS2","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":[10,44,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-832","post","type-post","status-publish","format-standard","hentry","category-learn","category-spacecraft","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/832","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=832"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/832\/revisions"}],"predecessor-version":[{"id":1975,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/832\/revisions\/1975"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=832"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=832"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=832"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=832"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=832"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=832"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=832"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=832"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=832"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}