{"id":68932,"date":"2020-04-28T18:21:32","date_gmt":"2020-04-28T15:21:32","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=68932"},"modified":"2020-04-28T18:21:32","modified_gmt":"2020-04-28T15:21:32","slug":"e-ceva-putred-in-spatiul-cosmic-cum-de-rezista-satelitii-si-telescoapele-la-temperaturi-de-2-000c-in-termosfera-pamantului","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/e-ceva-putred-in-spatiul-cosmic-cum-de-rezista-satelitii-si-telescoapele-la-temperaturi-de-2-000c-in-termosfera-pamantului\/","title":{"rendered":"E ceva putred \u00een spa\u0163iul cosmic: cum de rezist\u0103 sateli\u0163ii \u015fi telescoapele la temperaturi de 2.000\u00b0C, \u00een termosfera P\u0103m\u00e2ntului?"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2020\/04\/sateliti.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-68934\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2020\/04\/sateliti.jpg\" alt=\"\" width=\"354\" height=\"204\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2020\/04\/sateliti.jpg 354w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2020\/04\/sateliti-300x173.jpg 300w\" sizes=\"auto, (max-width: 354px) 100vw, 354px\" \/><\/a>De la lansarea sateli\u0163ilor Sputnik \u00een anii &#8217;50, mii de sateli\u021bi au fost pu\u0219i pe orbit\u0103 \u00een jurul P\u0103m\u00e2ntului \u0219i chiar \u0219i \u00een jurul altor planete. Fiecare a \u00eendeplinit un scop diferit, de la sta\u021bii spa\u021biale complexe precum Sta\u021bia Spa\u021bial\u0103 Interna\u021bional\u0103 la Sistemul de Pozi\u021bionare Global\u0103 (GPS). Majoritatea sateli\u021bilor pot fi considera\u0163i a fi \u201e\u00een spa\u021biul cosmic\u201d, dar \u00een ceea ce prive\u0219te atmosfera P\u0103m\u00e2ntului, ei se afl\u0103 fie \u00een termosfer\u0103, fie \u00een exosfer\u0103. Stratul prin care orbiteaz\u0103 un satelit depinde de scopul satelitului \u0219i de orbita avut\u0103.<\/p>\n<p>Termosfera este o regiune cu temperaturi foarte ridicate, care se extinde din v\u00e2rful mezosferei la aproximativ 80 &#8211; 800 de kilometri deasupra suprafe\u021bei P\u0103m\u00e2ntului. Se nume\u0219te termosfer\u0103, deoarece temperaturile cresc p\u00e2n\u0103 la niveluri mari de temperatur\u0103.<\/p>\n<p>Temperaturile depind foarte mult de activitatea solar\u0103 \u0219i pot cre\u0219te p\u00e2n\u0103 la 2.000\u00b0C. Radia\u021bia face ca particulele de atmosfer\u0103 din acest strat s\u0103 fie \u00eenc\u0103rcate electric, permi\u021b\u00e2nd undelor radio s\u0103 fie recep\u0163ionate dincolo de orizont. \u00cen exosfer\u0103, \u00eencep\u00e2nd cu 500 &#8211; 1.000 de kilometri deasupra suprafe\u021bei P\u0103m\u00e2ntului, atmosfera se transform\u0103 \u00een spa\u021biu cosmic. Gazul foarte diluat din acest strat poate atinge 2.500\u00b0C \u00een timpul zilei.<\/p>\n<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2020\/04\/termosfera.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-68933\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2020\/04\/termosfera.jpg\" alt=\"\" width=\"543\" height=\"730\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2020\/04\/termosfera.jpg 543w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2020\/04\/termosfera-223x300.jpg 223w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2020\/04\/termosfera-312x420.jpg 312w\" sizes=\"auto, (max-width: 543px) 100vw, 543px\" \/><\/a>Singurele elemente din tabelul periodic care pot rezista la 2500\u00b0C sunt carbon, niobiu, molibden, tantal, tungsten, reniu \u0219i osmiu. Cu excep\u021bia carbonului, aceste metale sunt foarte grele, extrem de conductive la \u00eenc\u0103lzire, iar majoritatea sunt foarte ductile atunci c\u00e2nd sunt tratate termic, ceea ce \u00eenseamn\u0103 c\u0103 se \u00eendoaie. Carbonul are chiar \u0219i cea mai ridicat\u0103 conductivitate termic\u0103 dintre toate materialelor cunoscute.<\/p>\n<p>Panourile solare care sunt folosite de sateli\u0163i abia func\u021bioneaz\u0103. Astfel, are loc o sc\u0103dere cu 1,1% a produc\u021biei de electricitate pentru fiecare cre\u0219tere \u00een grad Celsius a panourilor solare fotovoltaice, odat\u0103 ce au atins 42\u00b0C iar, desigur, la 1414\u00b0C, siliciu se tope\u015fte. Ciudat, dar ni se spune c\u0103 telescopul Hubble \u0219i al\u0163i sateli\u021bi folosesc arsenid de galiu, \u00een loc de siliciu, care se tope\u0219te la o temperatur\u0103 chiar mai sc\u0103zut\u0103 de 1238\u00b0C.<\/p>\n<p>De ce nu se topesc sateli\u0163ii la asemenea temperaturi? Fizica \u015fi Wikipedia ne explic\u0103 c\u0103 asta se datoreaz\u0103 datorit\u0103 apropierii de vid:<\/p>\n<p><em>&#8222;Gazul foarte diluat din acest strat poate atinge 2500\u00b0C \u00een timpul zilei. Chiar dac\u0103 temperatur\u0103 este at\u00e2t de ridicat\u0103, nu se simte c\u0103ldur\u0103 \u00een termosfer\u0103, deoarece ea este at\u00e2t de aproape de vid, \u00eenc\u00e2t nu exist\u0103 suficient contact cu pu\u021binii atomi de gaz pentru a transfera mult\u0103 c\u0103ldur\u0103. Un termometru normal ar fi semnificativ sub 0\u00b0C, deoarece energia pierdut\u0103 prin radia\u021bia termic\u0103 ar dep\u0103\u0219i energia dob\u00e2ndit\u0103 din gazul atmosferic prin contact direct&#8221;.<br \/>\n<\/em><\/p>\n<p>Dar, temperaturile termosferice cresc odat\u0103 cu altitudinea, datorit\u0103 absorb\u021biei radia\u021biilor solare puternic energetice. A\u015fadar, sursa de c\u0103ldur\u0103 a termosferei nu sunt cei c\u00e2\u021biva atomi de gaz, ci Soarele.<\/p>\n<p>Chiar \u0219i NASA recunoa\u015fte acest lucru: <em>&#8222;C\u0103ldura traverseaz\u0103 printr-un vid prin radia\u021bii infraro\u0219ii. Soarele emite constant radia\u0163ii infraro\u0219ii, iar P\u0103m\u00e2ntul absoarbe \u0219i transform\u0103 energia \u00een mi\u0219care atomic\u0103 \u0219i molecular\u0103 sau c\u0103ldur\u0103&#8221;<\/em>.<\/p>\n<p>A\u015fadar, pentru ca sateli\u0163ii \u015fi telescoapele spa\u0163iale s\u0103 reziste, ele trebuie acoperite cu un strat lucios reflector, care s\u0103 reflecte radia\u0163iile solare. \u00cens\u0103, exist\u0103 o problem\u0103. Niciunul din sateli\u0163i nu au strat lucios reflector, care s\u0103 reflecte radia\u0163iile; doar telescopul Hubble are o folie de aluminiu. Dar, \u015fi aceast\u0103 folie: chiar dac\u0103 ar putea rezista la c\u0103ldur\u0103 de 1500\u00b0C, cu siguran\u021b\u0103 nu ar fi \u00een m\u0103sur\u0103 s\u0103 opreasc\u0103 c\u0103ldura care s\u0103 treac\u0103 la celelalte materiale ale telescopului&#8230; A\u015fadar, cum de nu se transform\u0103 \u00een scrum!?<\/p>\n<p>Chiar dac\u0103 to\u0163i sateli\u0163ii \u015fi ma\u015fin\u0103riile spa\u0163iale ar fi \u00eenchise ermetic \u00een materiale care reflect\u0103 radia\u0163iile \u00een infraro\u015fu, nu ar exista loc unde s\u0103 fie radiat\u0103 aceast\u0103 c\u0103ldur\u0103, deoarece c\u0103ldura din termosfer\u0103 se afl\u0103 \u00eentotdeauna acolo. Nu exist\u0103 un loc mai rece pentru c\u0103ldura s\u0103 se transfere, a\u015fa cum spune cea de-a doua lege a termodinamicii&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>De la lansarea sateli\u0163ilor Sputnik \u00een anii &#8217;50, mii de sateli\u021bi au fost pu\u0219i pe orbit\u0103 \u00een jurul P\u0103m\u00e2ntului \u0219i chiar \u0219i \u00een jurul altor planete. Fiecare a \u00eendeplinit un scop diferit, de la sta\u021bii spa\u021biale complexe precum Sta\u021bia Spa\u021bial\u0103 &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"E ceva putred \u00een spa\u0163iul cosmic: cum de rezist\u0103 sateli\u0163ii \u015fi telescoapele la temperaturi de 2.000\u00b0C, \u00een termosfera P\u0103m\u00e2ntului?\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/e-ceva-putred-in-spatiul-cosmic-cum-de-rezista-satelitii-si-telescoapele-la-temperaturi-de-2-000c-in-termosfera-pamantului\/#more-68932\" aria-label=\"Cite\u0219te mai multe despre E ceva putred \u00een spa\u0163iul cosmic: cum de rezist\u0103 sateli\u0163ii \u015fi telescoapele la temperaturi de 2.000\u00b0C, \u00een termosfera P\u0103m\u00e2ntului?\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":68934,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[475],"tags":[4515,2502,346,2671,3481,358,66,14249,348,2693,4234,4157,4447,14250,7149,150,4216,105,732,3204,814,6787,865,3374,5133,3457,434,5025,2358,14248,4520,3584,3629,5287],"class_list":["post-68932","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-conspiratii-mistere","tag-aluminiu","tag-atmosfera","tag-atomi","tag-caldura","tag-carbon","tag-conspiratii-si-mistere","tag-energie","tag-exosfera","tag-fizica","tag-gaze","tag-gps","tag-infrarosii","tag-metal","tag-mezosfera","tag-molibden","tag-nasa","tag-orbita","tag-pamant","tag-planeta","tag-radiatii","tag-sateliti","tag-siliciu","tag-soare","tag-sputnik","tag-statia-spatiala-internationala","tag-tantal","tag-telescop","tag-telescopul-hubble","tag-temperatura","tag-termosfera","tag-tungsten","tag-unde-radio","tag-vid","tag-wikipedia","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>E ceva putred \u00een spa\u0163iul cosmic: cum de rezist\u0103 sateli\u0163ii \u015fi telescoapele la temperaturi de 2.000\u00b0C, \u00een termosfera P\u0103m\u00e2ntului? - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/e-ceva-putred-in-spatiul-cosmic-cum-de-rezista-satelitii-si-telescoapele-la-temperaturi-de-2-000c-in-termosfera-pamantului\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"E ceva putred \u00een spa\u0163iul cosmic: cum de rezist\u0103 sateli\u0163ii \u015fi telescoapele la temperaturi de 2.000\u00b0C, \u00een termosfera P\u0103m\u00e2ntului?\" \/>\n<meta property=\"og:description\" content=\"De la lansarea sateli\u0163ilor Sputnik \u00een anii &#8217;50, mii de sateli\u021bi au fost pu\u0219i pe orbit\u0103 \u00een jurul P\u0103m\u00e2ntului \u0219i chiar \u0219i \u00een jurul altor planete. 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