{"id":97512,"date":"2025-04-13T23:49:03","date_gmt":"2025-04-13T20:49:03","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=97512"},"modified":"2025-04-13T23:49:03","modified_gmt":"2025-04-13T20:49:03","slug":"au-fost-gasite-patru-planete-ascunse-in-apropierea-noastra-spune-un-studiu-stiintific","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/au-fost-gasite-patru-planete-ascunse-in-apropierea-noastra-spune-un-studiu-stiintific\/","title":{"rendered":"Au fost g\u0103site patru planete ascunse \u00een apropierea noastr\u0103 &#8211; spune un studiu \u015ftiin\u0163ific"},"content":{"rendered":"<figure id=\"attachment_97513\" aria-describedby=\"caption-attachment-97513\" style=\"width: 336px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/04\/4-planete-barnards-star.jpeg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-97513\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/04\/4-planete-barnards-star.jpeg\" alt=\"\" width=\"346\" height=\"312\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/04\/4-planete-barnards-star.jpeg 532w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/04\/4-planete-barnards-star-300x271.jpeg 300w\" sizes=\"auto, (max-width: 346px) 100vw, 346px\" \/><\/a><figcaption id=\"caption-attachment-97513\" class=\"wp-caption-text\"><strong>Imagine<\/strong>: generata de AI (<strong>Microsoft Designer<\/strong>)<\/figcaption><\/figure>\n<p>Astronomii au confirmat existen\u021ba a patru planete care orbiteaz\u0103 \u00een jurul <strong>Stelei lui Barnard<\/strong>, unul dintre cel mai apropiat vecin al nostru stelar, aflat\u0103 la doar 6 ani-lumin\u0103 distan\u021b\u0103. Folosind instrumente ultra-sensibile, oamenii de \u0219tiin\u021b\u0103 au detectat oscila\u021bii subtile \u00een lumina stelei cauzate de atrac\u021bia gravita\u021bional\u0103 a acestor planete mici, fiecare fiind cu mult mai mici dec\u00e2t P\u0103m\u00e2ntul.<\/p>\n<p>Steaua lui Barnard este a doua cea mai apropiat\u0103 stea fa\u0163\u0103 de noi (dup\u0103 sistemul stelar <strong>Alpha Centauri<\/strong>), \u0219i are o istorie lung\u0103 de alarme false atunci c\u00e2nd vine vorba de detectarea planetelor. Dar de data aceasta, dovezile par solide. Datorit\u0103 instrumentelor avansate, de \u00eenalt\u0103 precizie, cercet\u0103torii au confirmat prezen\u021ba a 4 planete minuscule. G\u0103sirea unor lumi at\u00e2t de mici nu este o sarcin\u0103 u\u0219oar\u0103, mai ales la aceast\u0103 distan\u021b\u0103, \u0219i face descoperirea cu at\u00e2t mai impresionant\u0103. Oamenii de \u0219tiin\u021b\u0103 au folosit o tehnic\u0103 numit\u0103 vitez\u0103 radial\u0103, care caut\u0103 mici balans\u0103ri \u00een lumina unei stele, cauzate de atrac\u021bia gravita\u021bional\u0103 a planetelor care orbiteaz\u0103. Cu c\u00e2t planeta este mai mic\u0103, cu at\u00e2t semnalul este mai slab, iar aceste 4 planete au doar aproximativ 1\/5 &#8211; 1\/3 din masa P\u0103m\u00e2ntului.<\/p>\n<p>Complic\u00e2nd lucrurile, stele precum Barnard sclipesc \u00een mod natural, cre\u00e2nd un &#8222;zgomot&#8221; care poate acoperi semnalele slabe ale planetelor mici. \u00cen acest caz, semnalele planetare au fost extrem de subtile, provoc\u00e2nd schimb\u0103ri de doar 0,2 &#8211; 0,5 metri pe secund\u0103. Zgomotul de fond din activitatea stelei a fost de aproape 10 ori mai mare, \u00een jur de 2 metri pe secund\u0103. Pentru separarea acestor &#8222;zgomote&#8221;, a fost nevoie de modelare avansat\u0103 \u0219i o tehnologie de ultim\u0103 or\u0103. Cum separ\u0103m semnalele planetei de &#8222;zgomotul&#8221; stelar? Astronomii au realizat modele matematice detaliate ale varia\u0163iilor luminoase ale Stelei lui Barnard, permi\u021b\u00e2ndu-le s\u0103 recunoasc\u0103 \u0219i s\u0103 elimine acele semnale din datele colectate de la stea.<\/p>\n<p>Noua lucrare care confirm\u0103 cele patru lumi minuscule &#8211; etichetate b, c, d \u0219i e &#8211; se bazeaz\u0103 pe date de la <strong>MAROON-X<\/strong>, un instrument de precizie extrem\u0103, ata\u0219at la <strong>Telescopul Gemini<\/strong> de pe v\u00e2rful muntelui Maunakea din Hawaii. Acesta confirm\u0103 detectarea planetei &#8222;b&#8221;, realizat\u0103 cu date anterioare de la <strong>ESPRESSO<\/strong>, un instrument ata\u0219at la <strong>Very Large Telescope<\/strong> din Chile. Iar noua lucrare dezv\u0103luie trei noi planete-gemene \u00een acela\u0219i sistem.<\/p>\n<p>Aceste planete orbiteaz\u0103 \u00een jurul stelei lor pitice ro\u0219ii mult prea aproape pentru a fi locuibile. &#8222;Anul&#8221; celei mai apropiate planete dureaz\u0103 pu\u021bin mai mult de 2 zile; pentru cea mai \u00eendep\u0103rtat\u0103 planet\u0103, este doar 7 zile. Probabil c\u0103 le face prea fierbin\u021bi pentru a sus\u021bine via\u021ba. Cu toate acestea, detectarea lor este de bun augur \u00een c\u0103utarea vie\u021bii dincolo de P\u0103m\u00e2nt. Oamenii de \u0219tiin\u021b\u0103 spun c\u0103 planetele mici, st\u00e2ncoase, precum a noastr\u0103, sunt probabil cele mai bune locuri pentru a c\u0103uta dovezi ale vie\u021bii a\u0219a cum o cunoa\u0219tem. Dar p\u00e2n\u0103 acum au fost cele mai dificil de detectat \u0219i caracterizat. M\u0103sur\u0103torile de \u00eenalt\u0103 precizie ale vitezei radiale, combinate cu tehnici mai clare pentru extragerea datelor, ar putea deschide noi ferestre \u00een lumi locuibile, poten\u021bial purt\u0103toare de via\u021b\u0103.<\/p>\n<p><strong>Sursa<\/strong>: studiul \u015ftiin\u0163ific <a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/2041-8213\/adb8d5\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;Four Sub-Earth Planets Orbiting Barnard&#8217;s Star from MAROON-X and ESPRESSO&#8221; \/ iopscience.iop.org<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Astronomii au confirmat existen\u021ba a patru planete care orbiteaz\u0103 \u00een jurul Stelei lui Barnard, unul dintre cel mai apropiat vecin al nostru stelar, aflat\u0103 la doar 6 ani-lumin\u0103 distan\u021b\u0103. Folosind instrumente ultra-sensibile, oamenii de \u0219tiin\u021b\u0103 au detectat oscila\u021bii subtile \u00een &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Au fost g\u0103site patru planete ascunse \u00een apropierea noastr\u0103 &#8211; spune un studiu \u015ftiin\u0163ific\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/au-fost-gasite-patru-planete-ascunse-in-apropierea-noastra-spune-un-studiu-stiintific\/#more-97512\" aria-label=\"Cite\u0219te mai multe despre Au fost g\u0103site patru planete ascunse \u00een apropierea noastr\u0103 &#8211; spune un studiu \u015ftiin\u0163ific\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":97513,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[5126,7396,102,2547,1367,352,19868,19867,3783,105,299,8271,3894,3175,434,19866,366],"class_list":["post-97512","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-alpha-centauri","tag-astronomi","tag-astronomie","tag-chile","tag-gravitatie","tag-hawaii","tag-maroon-x","tag-maunakea","tag-munte","tag-pamant","tag-planete","tag-stea-pitica-rosie","tag-steaua-lui-barnard","tag-stele","tag-telescop","tag-very-large-telescope","tag-viata","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>Au fost g\u0103site patru planete ascunse \u00een apropierea noastr\u0103 - spune un studiu \u015ftiin\u0163ific - 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\/au-fost-gasite-patru-planete-ascunse-in-apropierea-noastra-spune-un-studiu-stiintific\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Au fost g\u0103site patru planete ascunse \u00een apropierea noastr\u0103 - spune un studiu \u015ftiin\u0163ific\" \/>\n<meta property=\"og:description\" content=\"Astronomii au confirmat existen\u021ba a patru planete care orbiteaz\u0103 \u00een jurul Stelei lui Barnard, unul dintre cel mai apropiat vecin al nostru stelar, aflat\u0103 la doar 6 ani-lumin\u0103 distan\u021b\u0103. 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Folosind instrumente ultra-sensibile, oamenii de \u0219tiin\u021b\u0103 au detectat oscila\u021bii subtile \u00een ... 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