{"id":815,"date":"2004-12-03T09:46:00","date_gmt":"2004-12-03T08:46:00","guid":{"rendered":"https:\/\/kids.esa.int\/bridging_the_world\/"},"modified":"2026-10-08T00:32:35","modified_gmt":"2026-10-07T22:32:35","slug":"bridging_the_world","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/bridging_the_world\/","title":{"rendered":"Maailman yhdist\u00e4minen"},"content":{"rendered":"<div class=\"lede\">\n<p>Nyky\u00e4\u00e4n olemme tottuneet katsomaan suoraa televisiol\u00e4hetyst\u00e4 maailman toiselta puolelta. Urheilutapahtumat, haastattelut, puheet ja sodat \u2013 kaikkea t\u00e4t\u00e4 voi seurata mukavasti nojatuolista k\u00e4sin viestint\u00e4satelliittien ansiosta.<\/p>\n<\/div>\n<p>Ensimm\u00e4iset kokeilut, joissa radiosignaaleja yritettiin heijastaa avaruudessa olevista suurista ilmapalloista, eiv\u00e4t olleet kovin menestyksekk\u00e4it\u00e4. Niit\u00e4 seurasi hein\u00e4kuussa 1962 Telstar-niminen satelliitti. Se her\u00e4tti suurta huomiota l\u00e4hett\u00e4m\u00e4ll\u00e4 ensimm\u00e4iset suorat televisiokuvat Amerikasta Eurooppaan. Nyky\u00e4\u00e4n viestint\u00e4satelliitteja on satoja. Suurin osa niist\u00e4 on yksityisyritysten omistuksessa. Ne kiert\u00e4v\u00e4t geostationaarisella radalla 36 000 km:n korkeudella p\u00e4iv\u00e4ntasaajan yl\u00e4puolella, jotta ne voivat l\u00e4hett\u00e4\u00e4 signaalia laajalle alueelle.<\/p>\n<p>TV-, puhelin- ja radiosignaalit l\u00e4hetet\u00e4\u00e4n satelliittiin suuren lautasantennin avulla. Satelliitti vahvistaa niit\u00e4, mink\u00e4 j\u00e4lkeen ne l\u00e4hetet\u00e4\u00e4n vastaanottoasemalle. TV-signaaleja voidaan my\u00f6s l\u00e4hett\u00e4\u00e4 suoraan talojen katoilla oleviin lautasantenneihin.<\/p>\n<p>Viestint\u00e4satelliitit ovat nyky\u00e4\u00e4n eritt\u00e4in suuria ja tehokkaita. Monet niist\u00e4 laukaistaan Euroopan Ariane-raketilla. Ariane-5-raketilla 11. elokuuta 2005 laukaistu Thaicom 4 -satelliitti painoi 6,5 tonnia. Se oli kaikkien aikojen suurin yksityisomistuksessa oleva viestint\u00e4satelliitti.<\/p>","protected":false},"excerpt":{"rendered":"<p>Today, we are used to watching live TV from the other side of the world. Sports events, interviews, speeches, wars can all be seen from the comfort of an armchair, [&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\/2004\/12\/kids_watching_tv2\/17867599-3-eng-GB\/kids_watching_tv.jpg","esa_banner_description":"","esa_banner_credit":"AP Photo\/Luis Romero","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/12\/kids_watching_tv2","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":[10,54,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-815","post","type-post","status-publish","format-standard","hentry","category-learn","category-space-technologies-on-earth","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\/815","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=815"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/815\/revisions"}],"predecessor-version":[{"id":1958,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/815\/revisions\/1958"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=815"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=815"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=815"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=815"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=815"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=815"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=815"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=815"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=815"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}