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Two Supermassive Black Holes on the Verge of a Merger
Researchers have been keeping an eye on the center of a galaxy located about a billion light-years away. Every few months, the galaxy center releases a flash of X-rays, which appears to be coming from a pair of supermassive black holes orbiting one another. They're only about a light-day apart and contain a combined 40 million solar masses. They take 130 days to orbit and are expected to collide in about 70,000 years.
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