This pair of merging black holes is the closest to Earth we've ever found Space.comAstronomers Spot Two Supermassive Black Holes on a Collision Course GizmodoVery Large Telescope uncovers closest pair of supermassive black holes yet Phys.OrgJourney to the closest pair of supermassive black holes European Southern Observatory (ESO)Closest Supermassive Black Hole Pair to Earth Discovered, On Verge of Collision NewsweekView Full Coverage on Google News