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2. When Theory Became Reality

Observed by the Uhuru X-ray satellite in 1971, astronomers studying the constellation Cygnus found X-rays from what they suspected was a black hole, known as Cygnus X-1. It's over 6,000 light years from Earth, and at about 15 times the mass of the Sun, it's one of the heaviest stellar black holes ever found. Because it spins 800 times per second, the area around it has become a space-time vortex.

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