{"id":887,"date":"2007-03-16T12:23:00","date_gmt":"2007-03-16T11:23:00","guid":{"rendered":"https:\/\/kids.esa.int\/radar_s_icy_echoes_on_mars\/"},"modified":"2026-10-08T00:33:23","modified_gmt":"2026-10-07T22:33:23","slug":"radar_s_icy_echoes_on_mars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/cs\/radar_s_icy_echoes_on_mars\/","title":{"rendered":"Ledov\u00e9 ozv\u011bny radaru na Marsu"},"content":{"rendered":"<div class=\"lede\">\n<p>Mars je \u010dasto pova\u017eov\u00e1n za vyprahl\u00fd sv\u011bt pokryt\u00fd pou\u0161t\u011bmi. Stejn\u011b jako Zem\u011b m\u00e1 v\u0161ak i \u010cerven\u00e1 planeta dv\u011b velk\u00e9 ledov\u00e9 \u010depice na severn\u00edm a ji\u017en\u00edm p\u00f3lu. Pokud maj\u00ed lid\u00e9 jednoho dne \u017e\u00edt na Marsu, je d\u016fle\u017eit\u00e9 v\u011bd\u011bt, kolik zmrzl\u00e9 vody se v t\u011bchto ledov\u00fdch p\u0159\u00edkrovech nach\u00e1z\u00ed. Pr\u00e1v\u011b to nyn\u00ed zji\u0161\u0165uje p\u0159\u00edstroj MARSIS na sond\u011b Mars Express Evropsk\u00e9 kosmick\u00e9 agentury (ESA).<\/p>\n<\/div>\n<p>Za \u00fa\u010delem m\u011b\u0159en\u00ed tlou\u0161\u0165ky ji\u017en\u00edho ledov\u00e9ho \u0161t\u00edtu vys\u00edl\u00e1 radarov\u00fd p\u0159\u00edstroj neviditeln\u00e9 sign\u00e1ly sm\u011brem k povrchu a zaznamen\u00e1v\u00e1 odra\u017een\u00e9 sign\u00e1ly. T\u00edmto zp\u016fsobem je radar schopen \u2018vid\u011bt\u2019 skrz jednotliv\u00e9 vrstvy a\u017e na dno ledu. Bylo po\u0159\u00edzeno v\u00edce ne\u017e 300 t\u011bchto \u2018\u0159ez\u016f\u2019 skrz n\u00e1nosy ledu a prachu, kter\u00e9 pokr\u00fdvaj\u00ed p\u00f3l.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"2369\" data-credit=\"NASA\/JPL\/ASI\/ESA\/Univ. of Rome\/MOLA Science Team\/USGS\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/03\/Thickness_of_Mars_South_Polar_Layered_Deposits2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2007\/03\/thickness_of_mars_south_polar_layered_deposits2\/17892316-2-eng-GB\/Thickness_of_Mars_South_Polar_Layered_Deposits.jpg\" alt=\"Thickness of Mars&#x27; South Polar Layered Deposits\"><figcaption>Tlou\u0161\u0165ka vrstevnat\u00fdch usazenin na ji\u017en\u00edm p\u00f3lu Marsu<\/figcaption><\/figure>\n<p>Dnes v\u00edme, \u017ee ji\u017en\u00ed ledov\u00e1 \u010depice m\u00e1 tlou\u0161\u0165ku a\u017e 3,7 km. Kdyby se ve\u0161ker\u00fd led rozt\u00e1l, cel\u00e1 planeta by byla pokryta oce\u00e1nem hlubok\u00fdm asi 11 metr\u016f. Navzdory hmotnosti tohoto obrovsk\u00e9ho ledov\u00e9ho p\u0159\u00edkrovu nebyla hornina pod ledem stla\u010dena dol\u016f \u2013 co\u017e dokazuje, \u017ee je tu\u017e\u0161\u00ed ne\u017e zemsk\u00e1 k\u016fra.<\/p>\n<p>Prob\u00edhaj\u00edc\u00ed radarov\u00e9 studie severn\u00ed pol\u00e1rn\u00ed \u010depi\u010dky uk\u00e1zaly, \u017ee jej\u00ed tlou\u0161\u0165ka \u010din\u00ed p\u0159ibli\u017en\u011b 1,8 km. Tenk\u00e9 vrstvy vodn\u00edho ledu a prachu na obou p\u00f3lech jsou z\u0159ejm\u011b zp\u016fsobeny sez\u00f3nn\u00edmi i dlouhodob\u00fdmi zm\u011bnami klimatu. A\u010dkoli pol\u00e1rn\u00ed \u010depi\u010dky zadr\u017euj\u00ed v\u011bt\u0161inu zn\u00e1m\u00fdch z\u00e1sob vody na sou\u010dasn\u00e9m Marsu, jin\u00e1 m\u00edsta na planet\u011b mohla b\u00fdt v d\u00e1vn\u00e9 minulosti dostate\u010dn\u011b vlhk\u00e1, aby podporovala \u017eivot.<\/p>","protected":false},"excerpt":{"rendered":"<p>Mars is often regarded as an arid world covered by deserts. However, like Earth, the Red Planet has two large ice caps at its north and south poles. If people [&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\/2007\/03\/bright_lower_echo_from_mars_south-polar_layered_deposits2\/17901975-2-eng-GB\/Bright_lower_echo_from_Mars_south-polar_layered_deposits.jpg","esa_banner_description":"Bright lower echo from Mars\u2019 south-polar layered deposits","esa_banner_credit":"NASA\/JPL\/ASI\/ESA\/Univ. of Rome\/MOLA Science Team","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/03\/Bright_lower_echo_from_Mars_south-polar_layered_deposits2","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-887","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\/887","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=887"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts\/887\/revisions"}],"predecessor-version":[{"id":4723,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts\/887\/revisions\/4723"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/media?parent=887"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/categories?post=887"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/tags?post=887"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/panel?post=887"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/language?post=887"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/age?post=887"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/duration?post=887"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/resource_type?post=887"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/audience?post=887"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/wf_post_folders?post=887"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}