This artist's conception shows a late-stage galaxy merger and its two newly-discovered central black holes. The binary black holes are the closest together ever observed in multiple wavelengths. Credit: ALMA (ESO/NAOJ/NRAO); M. Weiss, NRAO/AUI/NSFAstronomers have found two ghostly Goliaths en route to a catastrophic meeting. The newly found pair of supermassive black holes are...
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