What Happens When Two Black Holes Collide?

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On September 14, 2015, signals from one of the Universe’s most mind-boggling, powerful events produced the tiniest signal in a pair of detectors, one in Louisiana and one in Washington state. They’d detected two already-wild objects, black holes, slamming into one another.

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https://gizmodo.com/what-happens-when-two-black-holes-collide-1830709233