{"id":1130,"date":"2004-11-15T15:52:00","date_gmt":"2004-11-15T14:52:00","guid":{"rendered":"https:\/\/kids.esa.int\/threats_from_space\/"},"modified":"2026-10-08T00:36:20","modified_gmt":"2026-10-07T22:36:20","slug":"threats_from_space","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/cs\/threats_from_space\/","title":{"rendered":"Hrozby z vesm\u00edru"},"content":{"rendered":"
\n

Zem\u011b je nejv\u011bt\u0161\u00ed ze \u010dty\u0159 kamenn\u00fdch planet na\u0161\u00ed slune\u010dn\u00ed soustavy. Vzhledem ke sv\u00e9 velikosti je velmi t\u011b\u017ek\u00e1. V jej\u00edm st\u0159edu se nach\u00e1z\u00ed velk\u00e9 j\u00e1dro bohat\u00e9 na \u017eelezo, kde teplota dosahuje 6 000 stup\u0148\u016f Celsia \u2013 je tam stejn\u011b horko jako na povrchu Slunce.<\/p>\n<\/div>\n

Tekut\u00e9 vn\u011bj\u0161\u00ed j\u00e1dro se p\u0159i ot\u00e1\u010den\u00ed planety v\u00ed\u0159\u00ed a funguje jako dynamo na j\u00edzdn\u00edm kole. D\u00edky tomuto dynamu se Zem\u011b chov\u00e1 jako siln\u00fd magnet.<\/p>\n

Magnetick\u00e9 pole Zem\u011b vytv\u00e1\u0159\u00ed kolem planety neviditelnou bublinu a funguje jako \u0161t\u00edt. Ten chr\u00e1n\u00ed planetu p\u0159ed v\u011bt\u0161inou \u010d\u00e1stic let\u00edc\u00edch vysokou rychlost\u00ed, kter\u00e9 do vesm\u00edru vymr\u0161\u0165uj\u00ed slune\u010dn\u00ed bou\u0159e. N\u011bkdy se \u010d\u00e1stic\u00edm poda\u0159\u00ed tuto bari\u00e9ru prolomit v bl\u00edzkosti magnetick\u00fdch p\u00f3l\u016f. V\u00fdsledkem jsou pol\u00e1rn\u00ed z\u00e1\u0159e \u2013 obecn\u011b zn\u00e1m\u00e9 jako severn\u00ed a ji\u017en\u00ed sv\u011btla.<\/p>\n

Povrch Zem\u011b je rovn\u011b\u017e chr\u00e1n\u011bn hustou atmosf\u00e9rou. Ta blokuje v\u011bt\u0161inu \u0161kodliv\u00e9ho z\u00e1\u0159en\u00ed z vesm\u00edru. Z\u00e1rove\u0148 zp\u016fsobuje, \u017ee mal\u00e9 p\u0159il\u00e9taj\u00edc\u00ed objekty sho\u0159\u00ed jako padaj\u00edc\u00ed hv\u011bzdy. Pouze v\u011bt\u0161\u00ed meteority a komety dopadnou na povrch a exploduj\u00ed, \u010d\u00edm\u017e zanechaj\u00ed velk\u00e9 kr\u00e1tery.<\/p>\n

Na rozd\u00edl od M\u011bs\u00edce a jin\u00fdch skalnat\u00fdch planet se dnes na Zemi nach\u00e1z\u00ed jen m\u00e1lo impaktn\u00edch kr\u00e1ter\u016f. V\u011bt\u0161ina z nich byla eroz\u00ed odnesena nebo zasyp\u00e1na p\u016fsoben\u00edm tekouc\u00ed vody, v\u011btru a ledu.<\/p>","protected":false},"excerpt":{"rendered":"

Earth is the largest of the four rocky planets in our Solar System. It is very heavy for its size. At its centre is a large, iron-rich core, where the […]<\/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\/05\/meteor_crater_in_arizona3\/17895645-2-eng-GB\/Meteor_Crater_in_Arizona.jpg","esa_banner_description":"Meteor Crater in Arizona","esa_banner_credit":"David Roddy, USGS","esa_banner_licence":"No ESA licences available","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/05\/Meteor_Crater_in_Arizona3","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-1130","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\/cs\/wp-json\/wp\/v2\/posts\/1130","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/comments?post=1130"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts\/1130\/revisions"}],"predecessor-version":[{"id":2273,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts\/1130\/revisions\/2273"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/media?parent=1130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/categories?post=1130"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/tags?post=1130"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/panel?post=1130"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/language?post=1130"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/age?post=1130"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/duration?post=1130"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/resource_type?post=1130"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/audience?post=1130"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/wf_post_folders?post=1130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}