{"id":823,"date":"2004-12-09T15:52:00","date_gmt":"2004-12-09T14:52:00","guid":{"rendered":"https:\/\/kids.esa.int\/space_velocity\/"},"modified":"2026-10-08T00:32:41","modified_gmt":"2026-10-07T22:32:41","slug":"space_velocity","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/et\/space_velocity\/","title":{"rendered":"Ruumi kiirus"},"content":{"rendered":"<div class=\"lede\">\n<p>Objekte, mis tiirlevad planeedi \u00fcmber, nimetatakse satelliitideks. Iga t\u00e4ielik ring, mille satelliit planeedi \u00fcmber teeb, nimetatakse orbiidiks.<\/p>\n<\/div>\n<p>Meie Maal on \u00fcks looduslik kaaslane \u2013 Kuu. Alates 1957. aasta oktoobrist on Maa \u00fcmber orbiidile viidud aga mitu tuhat kunstlikku (inimese loodud) satelliiti.<\/p>\n<p>Orbiidil p\u00fcsimiseks peab satelliit liikuma v\u00e4ga suure kiirusega, mis s\u00f5ltub k\u00f5rgusest. Seega on tavaliselt Maa pinnast 300 km k\u00f5rgusel asuva ringorbiidi puhul vaja kiirust 7,8 km\/s (28 000 km\/h). Sellise kiiruse juures teeb satelliit \u00fche tiiru \u00fcmber Maa 90 minutiga.<\/p>\n<p>Satelliidid peavad liikuma nii kiiresti, et kompenseerida Maa gravitatsiooni m\u00f5ju. See on sarnane olukorraga, kus keegi viskab kriketi- v\u00f5i pesapalli. Mida tugevamalt palli visatakse, seda kaugemale see lendab, enne kui maapinnale j\u00f5uab.<\/p>\n<p>Kui m\u00e4ngija suudaks palli visata piisavalt tugevalt, et see saavutaks vajaliku kiiruse, l\u00e4heks pall orbiidile. See ei kukuks kunagi tagasi Maale. Kui visata seda veelgi tugevamalt, nii et see saavutaks kiiruse 11,2 km\/s (40 300 km\/h) \u2013 mida nimetatakse \u2018p\u00f5genemiskiiruseks\u2019 \u2013, siis lahkub pall Maalt t\u00e4ielikult. Sellest saab siis P\u00e4ikese \u2018satelliit\u2019.<\/p>","protected":false},"excerpt":{"rendered":"<p>Objects that travel around a planet are called satellites. Each complete journey a satellite makes around the planet is called an orbit. Our Earth has one natural satellite \u2013 the [&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\/newton_s_cannon2\/17886950-2-eng-GB\/Newton_s_cannon.gif","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/12\/Newton_s_cannon2","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":[10,65,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-823","post","type-post","status-publish","format-standard","hentry","category-learn","category-mission-control","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/posts\/823","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/comments?post=823"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/posts\/823\/revisions"}],"predecessor-version":[{"id":1966,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/posts\/823\/revisions\/1966"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/media?parent=823"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/categories?post=823"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/tags?post=823"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/panel?post=823"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/language?post=823"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/age?post=823"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/duration?post=823"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/resource_type?post=823"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/audience?post=823"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/et\/wp-json\/wp\/v2\/wf_post_folders?post=823"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}