{"id":674576,"date":"2026-02-02T07:06:03","date_gmt":"2026-02-02T07:06:03","guid":{"rendered":"https:\/\/microscopemedia.com\/?p=674576"},"modified":"2026-02-02T07:06:03","modified_gmt":"2026-02-02T07:06:03","slug":"o-noua-amenintare-cosmica-ce-sunt-gaurile-negre-fugare-care-strabat-galaxiile","status":"publish","type":"post","link":"https:\/\/microscopemedia.com\/?p=674576","title":{"rendered":"O nou\u0103 amenin\u021bare cosmic\u0103: Ce sunt g\u0103urile negre \u201efugare\u201d care str\u0103bat galaxiile"},"content":{"rendered":"
<\/div>\n

\u00cen anii \u201960, matematicianul Roy Kerr a descris matematic g\u0103urile negre aflate \u00een rota\u021bie, baz\u00e2ndu-se pe teoria relativit\u0103\u021bii generale, arat\u0103 The Conversation<\/a>.<\/p>\n

Din aceste lucr\u0103ri au rezultat dou\u0103 concluzii importante. Prima arat\u0103 cum conform \u201eteoremei f\u0103r\u0103 p\u0103r\u201d (No-hair theorem)<\/span>, o gaur\u0103 neagr\u0103 este caracterizat\u0103 doar de mas\u0103, rota\u021bie \u0219i sarcin\u0103 electric\u0103. Iar a doua, indic\u0103 faptul c\u0103 p\u00e2n\u0103 la 29% din masa unei g\u0103uri negre poate fi stocat\u0103 sub form\u0103 de energie de rota\u021bie.<\/p>\n

Mai t\u00e2rziu, fizicianul Roger Penrose a ar\u0103tat c\u0103 aceast\u0103 energie poate fi extras\u0103. \u00cen cazul \u00een care dou\u0103 g\u0103uri negre rotative se ciocnesc, energia eliberat\u0103 sub form\u0103 de unde gravita\u021bionale poate fi distribuit\u0103 neuniform, \u00eemping\u00e2nd noua gaur\u0103 neagr\u0103 cu viteze de ordinul miilor de kilometri pe secund\u0103.<\/p>\n

Rolul undelor gravita\u021bionale<\/h2>\n

Primele dovezi directe au ap\u0103rut odat\u0103 cu detectarea undelor gravita\u021bionale, \u00eencep\u00e2nd din 2015. Observatoarele au \u00eenregistrat \u201esemn\u0103tura\u201d sonor\u0103 a g\u0103urilor negre nou formate dup\u0103 fuziuni. Analiza acestor semnale a ar\u0103tat c\u0103 unele coliziuni implic\u0103 rota\u021bii puternice \u0219i orient\u0103ri aleatorii. Se creaz\u0103 condi\u021bii ideale pentru a crea \u201eimpulsuri\u201d gravita\u021bionale capabile s\u0103 scoat\u0103 o gaur\u0103 neagr\u0103 din centrul unei galaxii.<\/p>\n

\n

Two\u2019s company, and three\u2019s a crowd\u2026 even when it comes to black holes!<\/p>\n

Hubble detected evidence of a \u201erunaway\u201d black hole that was ejected from its host galaxy after a tussle between it and two other black holes. Find out more: https:\/\/t.co\/hEs3i7MUma<\/a> pic.twitter.com\/5qUlaRsVmF<\/a><\/p>\n

\u2014 Hubble (@NASAHubble) April 6, 2023<\/a><\/p>\n<\/blockquote>\n

G\u0103urile negre de dimensiuni mici sunt greu de detectat \u00een mi\u0219care. \u00cens\u0103 cele supermasive, cu milioane sau miliarde de mase solare, \u00ee\u0219i fac sim\u021bit\u0103 prezen\u021ba. \u00cen timp ce traverseaz\u0103 o galaxie, acestea pot comprima gazul interstelar, declan\u0219\u00e2nd formarea de stele de-a lungul unei linii aproape perfecte \u2013 similar\u0103 cu urma l\u0103sat\u0103 de un avion.<\/p>\n

\u00cen 2025, mai multe echipe au publicat imagini cu astfel de structuri. Una, ob\u021binut\u0103 cu Telescopul Spa\u021bial James Webb, arat\u0103 o d\u00e2r\u0103 de stele \u00eentins\u0103 pe circa 200.000 de ani-lumin\u0103. Ea este atribuit\u0103 unei g\u0103uri negre de aproximativ 10 milioane de mase solare, deplas\u00e2ndu-se cu aproape 1.000 km\/s. Un alt caz prezint\u0103 o gaur\u0103 neagr\u0103 de circa 2 milioane de mase solare, cu o urm\u0103 de 25.000 de ani-lumin\u0103.<\/p>\n

Ar putea ajunge aproape de noi?<\/h2>\n

Dac\u0103 exist\u0103 gigan\u021bi fugari, este logic s\u0103 presupunem c\u0103 exist\u0103 \u0219i versiuni mai mici, greu de detectat cu instrumentele actuale. \u00cen teorie, un astfel de obiect ar putea traversa spa\u021biul intergalactic<\/a> \u0219i chiar sisteme stelare precum al nostru. \u00centr-un scenariu extrem, gravita\u021bia sa ar putea perturba orbitele planetelor.<\/p>\n

Speciali\u0219tii atrag \u00eens\u0103 aten\u021bia c\u0103 probabilitatea este extrem de redus\u0103 \u2013 un risc ipotetic, f\u0103r\u0103 motive reale de \u00eengrijorare.<\/p>\n

Descoperirea g\u0103urilor negre \u201efugare\u201d completeaz\u0103 imaginea complex\u0103 a cosmosului. Ele demonstreaz\u0103 c\u0103 universul este mai activ \u0219i imprevizibil dec\u00e2t presupuneam. De fapt, chiar \u0219i cele mai masive obiecte pot fi accelerate la viteze uria\u0219e, l\u0103s\u00e2nd urme vizibile \u00een structura galaxiilor.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00cen anii \u201960, matematicianul Roy Kerr a descris matematic g\u0103urile negre aflate \u00een rota\u021bie, baz\u00e2ndu-se pe teoria relativit\u0103\u021bii generale, arat\u0103 The Conversation. Din aceste lucr\u0103ri au rezultat dou\u0103 concluzii importante. … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":674577,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"Default","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/674576"}],"collection":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=674576"}],"version-history":[{"count":0,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/674576\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/media\/674577"}],"wp:attachment":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=674576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=674576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=674576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}