William Robinson writes: Astronomers from Max Planck Institute for Radio Astronomy in Bonn, Germany, have discovered three closely orbiting supermassive black holes in a galaxy more than 4 billion light-years away. This is the tightest trio of black holes known to date. Researchers say the discovery will help astronomers hunt gravitational waves, the ripples in the curvature of spacetime that propagate as a wave, travelling away from the source.
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