Unusual light signal yields clues about elusive black hole merger

Scientists have found what appear to be two supermassive black holes in the final stages of a merger, a rare event never seen before. The discovery could help shed light on a long-standing conundrum in astrophysics called the "final parsec problem," which refers to the failure of theoretical models to predict what the final stages of a black hole merger look like or even how long the process might take.

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