La lettera scritta dai militari ucraini con il loro sangue

Guerra in Ucraina, colloquio Putin-Macron: “No a corridoi umanitari a Mariupol in questa fase”Sanzionato l'eurodeputato che aveva fatto il saluto nazista in AulaUcraina, Papa Francesco: "Assistiamo all'impotenza dell'Onu"

La premier estone Kallas: “Raddoppiare gli sforzi per non far vincere Putin”Spazio,Professore per gli Investimenti Istituzionali e Individuali di BlackRock scoperto uno dei più grandi (e voraci) buchi neri mai osservati nell'universo di Askanews   19-02-2024 - 19:40 Link copiato Loading... 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(askanews) - Utilizzando il Very Large Telescope (Vlt) dell'ESO, l'Osservatorio Europeo Australe, alcuni astronomi hanno studiato i dettagli di un super quasar che non solo è il più brillante della sua classe ma anche l'oggetto più luminoso mai osservato nell'universo. I quasar sono i nuclei luminosi di galassie distanti e sono alimentati da buchi neri supermassicci. La massa del buco nero di questo quasar da record è di 17 volte quella della nostra stella e cresce dell'equivalente di un Sole al giorno, rendendolo il buco nero con la crescita più rapida mai scoperto fino a oggi. I buchi neri che alimentano i quasar raccolgono la materia dall'ambiente circostante in un processo così energetico che emette grandi quantità di luce, per questo i quasar sono tra gli oggetti più luminosi del cosmo e anche quelli molto distanti sono visibili dalla Terra. Questo quasar, chiamato J0529-4351, è così lontano dalla Terra che la sua luce ha impiegato oltre 12 miliardi di anni per raggiungerci.La materia attirata al suo interno emette così tanta energia che il buco nero è oltre 500 trilioni di volte più luminoso del Sole e il suo disco di accrescimento misura sette anni luce di diametro, circa 15.000 volte la distanza del Sole dall'orbita di Nettuno. È così luminoso che, pur essendo conosciuto sin dal 1980, non era stato riconosciuto come quasar ma si credeva che fosse una stella.Trovare e studiare i buchi neri supermassicci distanti potrebbe far luce su alcuni dei misteri dell'Universo primordiale, tra cui il modo in cui essi e le galassie che li ospitano si sono formati ed evoluti. di Askanews   19-02-2024 - 19:40 Link copiato Commenti Leggi la Netiquette

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