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Submission + - Trio of big black holes spotted in galaxy smashup (sciencemag.org)

sciencehabit writes: Astronomers staring across the universe have spotted a startling scene: three supermassive black holes orbiting close to one another, two of them just a few hundred light-years apart. The trio, housed in a pair of colliding galaxies, may help scientists hunting for ripples in spacetime known as gravitational waves.
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Trio of big black holes spotted in galaxy smashup

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