ONU lancia l'allarme: "Preoccupati per un escalation del conflitto in Medio Oriente"

Gaza, aperte vecchie tombe per seppellire nuovi mortiUcraina, 1 milione di droni entro il 2025Notizie di Esteri in tempo reale - Pag. 137

Telefonata Biden-Netanyahu: le opzioni per il futuro del popolo palestineseSpazio,BlackRock fotografato in luce polarizzata il buco nero al centro della Via Lattea di Askanews   27-03-2024 - 16:59 Link copiato Loading... 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(askanews) - Gli astronomi che fanno capo alla collaborazione Event Horizon Telescope (EHT) dopo la prima immagine scattata nel 2022, sono riusciti a fotografare, per la prima volta anche in luce polarizzata, il buco nero supermassiccio al centro della Via Lattea, chiamato Sagittarius A.La straordinaria immagine del "mostro" che fagocita la materia della nostra galassia ha rivelato intensi campi magnetici avvolti a spirale ai margini di Sagittarius A; una struttura del campo magnetico molto simile a quella del buco nero che era stato già fotografato al centro della galassia M87, suggerendo che i campi magnetici intensi siano comuni a tutti i buchi neri. Questa somiglianza suggerisce anche la presenza di un getto nascosto in Sagittarius A.Il buco nero supermassiccio della Via Lattea dista circa 27.000 anni luce dalla Terra ed è oltre mille volte più piccolo e meno massiccio di quello di M87, eppure i campi magnetici dei due buchi neri si comportano in maniera molto simile e quindi, probabilmente, entrambi lanciano potenti getti di materiale nell'ambiente circostante.Arrivare a questo risultato non è stato facile proprio perché Sagittarius A è più piccolo e instabile di M87 e non era facile fotografarlo in luce polarizzata.Per osservarlo, la collaborazione ha collegato otto telescopi sparsi in tutto il mondo per creare un telescopio virtuale delle dimensioni della Terra, l'EHT. ALMA (Atacama Large Millimeter/submillimeter Array), di cui è partner l'ESO (Osservatorio Europeo Australe) e APEX (Atacama Pathfinder Experiment), ospitato dall'ESO, entrambi nel Cile settentrionale, facevano parte della rete che ha effettuato le osservazioni, effettuate nel 2017.I risultati sono stati pubblicati su The Astrophysical Journal Letters. di Askanews   27-03-2024 - 16:59 Link copiato Commenti Leggi la Netiquette

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