Through a standard telescope, the nearby galaxy NGC 7727 looks like a gossamer tumbleweed drifting in the night sky. But within it are two supermassive black holes locked in a dance that will end with their violent merger. As a team of astronomers recently found, these objects are closer to Earth than any other…
source https://gizmodo.com/astronomers-spot-two-supermassive-black-holes-on-a-coll-1848137149
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