https://www.livescience.com/space/black-holes/scientists-think-they-detected-the-first-known-triple-black-hole-system-in-the-universe-and-then-watched-it-die
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Chinese astronomers have spotted a hidden supermassive black hole in the background of a peculiar gravitational wave event from a black hole merger, hinting that all three singularities were locked in a never-before-seen triple system.
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