Belching black hole proves a biggie: First known ‘middleweight’ black hole

Astronomers have found the first known ‘middleweight’ black hole. Before it was found, astronomers had good evidence for only supermassive black holes — ones a million to a billion times the mass of the Sun — and ‘stellar mass’ ones, three to thirty times the mass of the Sun.

Source: Belching black hole proves a biggie: First known ‘middleweight’ black hole

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