{"id":24855,"date":"2012-09-05T07:50:03","date_gmt":"2012-09-05T04:50:03","guid":{"rendered":"http:\/\/www.lovendal.net\/wp52\/?p=24855"},"modified":"2024-12-15T18:49:51","modified_gmt":"2024-12-15T16:49:51","slug":"daca-am-avea-o-nava-spatiala-care-ar-merge-cu-viteza-luminii-in-84-de-ani-un-astronaut-ar-putea-face-turul-intregului-univers","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/daca-am-avea-o-nava-spatiala-care-ar-merge-cu-viteza-luminii-in-84-de-ani-un-astronaut-ar-putea-face-turul-intregului-univers\/","title":{"rendered":"Dac\u0103 am avea o nav\u0103 spa\u0163ial\u0103 care ar merge cu viteza luminii, \u00een 84 de ani un astronaut ar putea face turul \u00eentregului Univers!"},"content":{"rendered":"
\"\"<\/a>
Imagine<\/strong>: pixabay.com<\/strong><\/a> (Commons Creative – free)<\/figcaption><\/figure>\n

Odat\u0103 cu descoperirea teoriei relativit\u0103\u0163ii a lui Einstein, omul modern \u015fi-a imaginat posibilitatea vizit\u0103rii Cosmosului cu ajutorul unei nave spa\u0163iale care s\u0103 mearg\u0103 cu (aproape) viteza luminii. Aceast\u0103 idee fiind foarte \u00eenr\u0103d\u0103cinat\u0103, s\u0103 discut\u0103m pu\u0163in critic asupra \u00eendep\u0103rtatei posibilit\u0103\u0163i teoretice. S\u0103 lu\u0103m ca baz\u0103 de pornire o rachet\u0103 fotonic\u0103 ce vrea s\u0103 ating\u0103 98%, din viteza luminii. Pentru ca s\u0103 nu ucidem astronautul nostru, e necesar ca accelera\u0163ia s\u0103 nu dep\u0103\u015feasc\u0103 \u00een decursul c\u0103l\u0103toriei valoarea de 1 g (9,8 m\/s2). S\u0103 vedem care vor fi astfel posibilit\u0103\u0163ile noastre teoretice de a vizita Cosmosul:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Durata drumului<\/strong><\/td>\ndus-\u00eentors<\/strong><\/td>\nSpa\u0163iul inspectabil<\/strong><\/td>\n<\/tr>\n
(\u00een ani)<\/strong><\/td>\n<\/td>\n(\u00een ani-lumin\u0103)<\/strong><\/td>\n<\/tr>\n
Pe bord<\/strong><\/td>\nPe p\u0103m\u00eent<\/strong><\/td>\n<\/tr>\n
1<\/strong><\/td>\n1,0<\/strong><\/td>\n0,26<\/strong><\/td>\n<\/tr>\n
2<\/strong><\/td>\n2,1<\/strong><\/td>\n0,25<\/strong><\/td>\n<\/tr>\n
5<\/strong><\/td>\n6,5<\/strong><\/td>\n1,7<\/strong><\/td>\n<\/tr>\n
10<\/strong><\/td>\n24<\/strong><\/td>\n10<\/strong><\/td>\n<\/tr>\n
15<\/strong><\/td>\n80<\/strong><\/td>\n37<\/strong><\/td>\n<\/tr>\n
20<\/strong><\/td>\n270<\/strong><\/td>\n137<\/strong><\/td>\n<\/tr>\n
25<\/strong><\/td>\n910<\/strong><\/td>\n455<\/strong><\/td>\n<\/tr>\n
30<\/strong><\/td>\n3 100<\/strong><\/td>\n1 560<\/strong><\/td>\n<\/tr>\n
40<\/strong><\/td>\n36 000<\/strong><\/td>\n17 500<\/strong><\/td>\n<\/tr>\n
50<\/strong><\/td>\n420 000<\/strong><\/td>\n208 000<\/strong><\/td>\n<\/tr>\n
60<\/strong><\/td>\n5 000 000<\/strong><\/td>\n2 470 000<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

O prim\u0103 lectur\u0103 a acestui tabel poate s\u0103 ne extazieze, c\u0103ci se vede c\u0103, \u00een condi\u0163iile acceler\u0103rii continue de la 1 g, \u00een 7 ani de c\u0103l\u0103torie voiajorul cosmic ar putea face drumul Alpha Centauri dus-\u00eentors; \u00een 38 de ani ar ajunge \u00een mijlocul C\u0103ii Lactee; \u00een 52 de ani ar vizita Nebuloasa Andromeda, galaxia cea mai apropiat\u0103, iar \u00een 84 de ani ar putea s\u0103 fac\u0103 turul Universului cunoscut!<\/p>\n

Foarte impresionant, dar s\u0103 vedem ce condi\u0163ion\u0103ri mai apar. Un autor pe nume Hoerner, \u00eentr-un studiu din 1962 intitulat „Limitele generale ale c\u0103l\u0103toriei \u00een spa\u0163iu”<\/em> face o serie de calcule cu privire la posibilit\u0103\u0163ile teoretice de folosire a unei nave spa\u0163iale ce merge cu viteza luminii. Autorul porne\u015fte \u00een calculele sale cu 10 tone de mas\u0103 util\u0103 (compartimentul de locuit, biocenoza necesar\u0103 supravie\u0163uirii, aparate, plus personalul), cu un motor rachet\u0103 ultraperfec\u0163ionat de 10 tone, masa ini\u0163ial\u0103 fiind fixat\u0103 la 200 de tone, pentru a efectua o c\u0103l\u0103torie dus-\u00eentors p\u00e2n\u0103 la steaua cea mai apropiat\u0103. Ce energie trebuie s\u0103 dezvolte acest sistem? 6*1014<\/sup> W. Num\u0103rul este aproximativ de 100 de ori mai mare dec\u00e2t energia consumat\u0103 azi pe \u00eentregul Pam\u00e2nt! Dac\u0103 mai punem la socoteal\u0103 c\u0103 energia aceasta trebuie s\u0103 fie \u00eenghi\u0163it\u0103 de un motora\u015f de 10 t, f\u0103r\u0103 s\u0103 se defecteze, f\u0103r\u0103 s\u0103 se uzeze, merg\u00e2nd \u00een continuu 7 ani, f\u0103r\u0103 s\u0103 se supra\u00eenc\u0103lzeasc\u0103, gluma pare s\u0103 se \u00eengroa\u015fe. Pentru o c\u0103l\u0103torie galactic\u0103 acela\u015fi motora\u015f trebuie s\u0103 reziste la trecerea energiilor a milioane de sori!<\/p>\n

P.S. Pentru cei care nu \u00een\u0163eleg cum vine cu timpul pe bordul navei spa\u0163iale \u015fi cel de pe P\u0103m\u00e2nt, le recomand acest articol: Iat\u0103 cum se scurge timpul pe o nav\u0103 spa\u0163ial\u0103 ce se apropie foarte mult de viteza luminii<\/strong><\/a>.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Odat\u0103 cu descoperirea teoriei relativit\u0103\u0163ii a lui Einstein, omul modern \u015fi-a imaginat posibilitatea vizit\u0103rii Cosmosului cu ajutorul unei nave spa\u0163iale care s\u0103 mearg\u0103 cu (aproape) viteza luminii. Aceast\u0103 idee fiind foarte \u00eenr\u0103d\u0103cinat\u0103, s\u0103 discut\u0103m pu\u0163in critic asupra \u00eendep\u0103rtatei posibilit\u0103\u0163i teoretice. … <\/p>\n

Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":96012,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[5126,3058,1405,348,105,733,9803,1087,2916],"class_list":["post-24855","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-alpha-centauri","tag-astronaut","tag-calea-lactee","tag-fizica","tag-pamant","tag-stea","tag-stiinta","tag-univers","tag-viteza-luminii","resize-featured-image"],"yoast_head":"\nDac\u0103 am avea o nav\u0103 spa\u0163ial\u0103 care ar merge cu viteza luminii, \u00een 84 de ani un astronaut ar putea face turul \u00eentregului Univers! - 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\/daca-am-avea-o-nava-spatiala-care-ar-merge-cu-viteza-luminii-in-84-de-ani-un-astronaut-ar-putea-face-turul-intregului-univers\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dac\u0103 am avea o nav\u0103 spa\u0163ial\u0103 care ar merge cu viteza luminii, \u00een 84 de ani un astronaut ar putea face turul \u00eentregului Univers!\" \/>\n<meta property=\"og:description\" content=\"Odat\u0103 cu descoperirea teoriei relativit\u0103\u0163ii a lui Einstein, omul modern \u015fi-a imaginat posibilitatea vizit\u0103rii Cosmosului cu ajutorul unei nave spa\u0163iale care s\u0103 mearg\u0103 cu (aproape) viteza luminii. 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