{"id":47706,"date":"2017-02-02T12:26:32","date_gmt":"2017-02-02T10:26:32","guid":{"rendered":"http:\/\/www.lovendal.ro\/wp52\/?p=47706"},"modified":"2017-02-02T12:28:09","modified_gmt":"2017-02-02T10:28:09","slug":"putem-calatori-pana-la-cea-mai-apropiata-stea-proxima-centauri-in-doar-20-de-ani-cu-ajutorul-laserului-dar-cum-reusim-sa-franam-sonda-spatiala-minuscula","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/putem-calatori-pana-la-cea-mai-apropiata-stea-proxima-centauri-in-doar-20-de-ani-cu-ajutorul-laserului-dar-cum-reusim-sa-franam-sonda-spatiala-minuscula\/","title":{"rendered":"Putem c\u0103l\u0103tori p\u00e2n\u0103 la cea mai apropiat\u0103 stea, Proxima Centauri, \u00een doar 20 de ani, cu ajutorul laserului! Dar cum reu\u015fim s\u0103 fr\u00e2n\u0103m sonda spa\u0163ial\u0103 minuscul\u0103?"},"content":{"rendered":"

\"\"Vis\u0103m la tehnologii care s\u0103 ne duc\u0103 rapid pe alte stele, dar, dac\u0103 ajungem acolo, cum am putea fr\u00e2na nava spa\u0163ial\u0103 respectiv\u0103 ce s-ar deplasa cu o vitez\u0103 fantastic\u0103? Rene Heller de la Institutul Max Planck pentru Cercetarea Sistemului Solar \u015fi cercet\u0103torul spa\u0163ial independent, Michael Hippke, au acum un r\u0103spuns la aceast\u0103 \u00eentrebare: putem \u00eencetini o nav\u0103 spa\u0163ial\u0103, propulsat\u0103 de un laser, folosind stelele \u00een sine.<\/p>\n

Cel mai apropiat sistem solar, Alpha Centauri, se afl\u0103 la peste 4 ani-lumin\u0103 distan\u021b\u0103. Tehnologiile de propulsie chimice actuale sunt prea pu\u0163in practice: cu ele, ne-ar lua 100.000 de ani (sau 30.000 de ani, conform altor surse) pentru a ajunge acolo. Cu toate acestea, o idee \u015fi-a f\u0103cut loc \u00een mintea cercet\u0103torilor: lasere de pe P\u0103m\u00e2nt ar putea accelera nave spa\u0163iale ultra-u\u015foare p\u00e2n\u0103 la aproximativ 20% din viteza luminii, \u00een c\u00e2teva minute. Asta \u00eenseamn\u0103 c\u0103 o mini-sond\u0103 spa\u0163ial\u0103 interstelar\u0103 ar putea ajunge \u00een sistemul Alpha Centauri, mai precis la steaua Proxima Centauri, care con\u0163ine o planet\u0103 asem\u0103n\u0103toare P\u0103m\u00e2ntului, la doar 20 de ani (sau 30 de ani) de la lansare.<\/p>\n

Anul trecut (2016), miliardarul Yuri Milner a promis 100 milioane de dolari pentru a face asta: a trimite sonde mici pentru a vizita sistemul Alpha Centauri \u0219i a-l investiga. Am vorbit \u015fi eu despre asta \u00eentr-un articol publicat \u00een aprilie 2016 (Wow! \u015eeful Facebook vrea s\u0103 trimit\u0103 o nav\u0103 spa\u0163ial\u0103 miniatural\u0103 c\u0103tre cea mai apropiat\u0103 stea, sistemul Alpha Centauri! Aceasta va ajunge acolo \u00een doar 30 de ani, cu ajutorul laserului!<\/strong><\/a>). Din p\u0103cate, la aceast\u0103 vitez\u0103 fantastic\u0103, sonda minuscul\u0103 ar trece prin \u00eentregul sistem stelar \u00een doar c\u00e2teva ore, ceea ce ar face imposibil\u0103 o investiga\u0163ie \u015ftiin\u0163ific\u0103 serioas\u0103.<\/p>\n

O op\u021biune de fr\u00e2nare ar fi aceea ca nava spa\u0163ial\u0103 s\u0103 transporte combustibil, care s\u0103 poat\u0103 fi folosit la procesul de \u00eencetinire. De asemenea, s-ar putea folosi \u015fi energia laserului, pentru ca sonda s\u0103 mearg\u0103 \u00een sens invers; dar, toate acestea ar face ca sonda spa\u0163ial\u0103 s\u0103 se „r\u0103stoarne” \u015fi s\u0103 func\u0163ioneze defectuos.<\/p>\n

Acum \u00eens\u0103, cercet\u0103torii Hippke \u0219i Heller au ar\u0103tat c\u0103 o combina\u021bie dintre gravita\u0163ia stelei \u0219i presiunea radia\u0163iei de la fotonii stelei ar putea duce sonda pe o orbit\u0103 stabil\u0103 \u00een jurul stelei. Ideea este „viabil\u0103 \u015ftiin\u0163ific \u015fi foarte interesant\u0103”<\/em>, a spus Avi Loeb de la Universitatea Harvard.<\/p>\n

\u00cens\u0103, preocuparea oamenilor de \u015ftiin\u0163\u0103 este aceea c\u0103 mini-sonda spa\u0163ial\u0103 ce ar putea fi construit\u0103 pentru a ajunge la Alpha Centauri \u00een doar 20 de ani, trebuie s\u0103 fie extrem de u\u015foar\u0103, asta \u00eensemn\u00e2nd doar c\u00e2\u0163iva atomi grosime. Sonda spa\u0163ial\u0103 minuscul\u0103 ar trebui s\u0103 fie mai sub\u0163ire dec\u00e2t lungimea de und\u0103 a luminii, pentru a fi propulsat\u0103.<\/p>\n

Sursa (traducerea \u015fi adaptarea):<\/strong><\/em> newscientist.com<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Vis\u0103m la tehnologii care s\u0103 ne duc\u0103 rapid pe alte stele, dar, dac\u0103 ajungem acolo, cum am putea fr\u00e2na nava spa\u0163ial\u0103 respectiv\u0103 ce s-ar deplasa cu o vitez\u0103 fantastic\u0103? Rene Heller de la Institutul Max Planck pentru Cercetarea Sistemului Solar … <\/p>\n

Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":47707,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039,2833],"tags":[5126,102,346,4752,10345,1367,2634,952,105,732,4490,3417,8186,733,2250,1840,2916],"class_list":["post-47706","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","category-noutati","tag-alpha-centauri","tag-astronomie","tag-atomi","tag-fotoni","tag-frana","tag-gravitatie","tag-laser","tag-lumina","tag-pamant","tag-planeta","tag-proxima-centauri","tag-sistem-solar","tag-sonda-spatiala","tag-stea","tag-universitate","tag-viteza","tag-viteza-luminii","resize-featured-image"],"yoast_head":"\nPutem c\u0103l\u0103tori p\u00e2n\u0103 la cea mai apropiat\u0103 stea, Proxima Centauri, \u00een doar 20 de ani, cu ajutorul laserului! 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Dar cum reu\u015fim s\u0103 fr\u00e2n\u0103m sonda spa\u0163ial\u0103 minuscul\u0103? - Secretele lui Lovendal","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.lovendal.ro\/wp52\/putem-calatori-pana-la-cea-mai-apropiata-stea-proxima-centauri-in-doar-20-de-ani-cu-ajutorul-laserului-dar-cum-reusim-sa-franam-sonda-spatiala-minuscula\/","og_locale":"ro_RO","og_type":"article","og_title":"Putem c\u0103l\u0103tori p\u00e2n\u0103 la cea mai apropiat\u0103 stea, Proxima Centauri, \u00een doar 20 de ani, cu ajutorul laserului! Dar cum reu\u015fim s\u0103 fr\u00e2n\u0103m sonda spa\u0163ial\u0103 minuscul\u0103?","og_description":"Vis\u0103m la tehnologii care s\u0103 ne duc\u0103 rapid pe alte stele, dar, dac\u0103 ajungem acolo, cum am putea fr\u00e2na nava spa\u0163ial\u0103 respectiv\u0103 ce s-ar deplasa cu o vitez\u0103 fantastic\u0103? Rene Heller de la Institutul Max Planck pentru Cercetarea Sistemului Solar ... 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