Not too big and not too small! Astronomers discover an elusive 'Goldilocks' black hole that is 55,000 times the mass of the sun and could help to explain how the stellar phenomena form

dailymail.co.uk - Ryan Morrison • 671d

A 'Goldilocks' black hole that is about 55,000 times the mass of the sun has been discovered by astronomers, who say it is 'not too big, and not too …

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