In a galaxy four billion light-years away, three supermassive black holes are locked in a whirling embrace. It’s the tightest trio of black holes known to date and even suggests that these closely packed systems are more common than previously thought. “What remains extraordinary to me is that these black holes, which are at the … Continue reading "Three Supermassive Black Holes Tango in a Distant Galaxy, Marking a Huge Discovery"