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It can be tricky to measure the spin of a black hole, particularly when it's hard to see them, but astronomers have pulled off just such a feat. They've gauged the spins of five supermassive black holes through a combination of data from the Chandra X-ray Observatory and gravitational lensing, or the use of gravity from celestial bodies to magnify very distant objects.

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Alex
Arizona City, United States
08.07.2019 (11 days ago)
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