10 years ago
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Scientists Directly Measure Spin of Extremely Distant Supermassive Black Hole
A team of astrophysicists has directly measured the spin of a supermassive black hole in the quasar RX J1131-1231, located 6 billion light years away.
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TLDR: "The discovery that the black hole in RX J1131-1231 is spinning at over half the speed of light suggests that this black hole has grown via mergers, rather than pulling material in from different directions."