Ultramassive black hole discovered by UK astronomers, Black holes

Durham University scientists say black hole about 30 billion times the mass of the Sun is first to be found with gravitational lensing

Holm 15A: Supermassive Black Hole 40 Billion Times the Mass of the

Science from scratch: just how big is a supermassive black hole

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Astronomers discover ultramassive black hole using new technique

Astronomers discover one of biggest black holes ever recorded

Supermassive black hole at heart of ancient galaxy 'far larger

RX J1532: Extremely Powerful Ultramassive Black Hole Discovered

Scientists Discover The First Ultra Massive Black Hole

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Astronomers discover one of biggest black holes ever recorded