Brilliant gamma-ray flare 100 times brighter than our entire galaxy reveals 1 monster black hole is actually 2
A second supermassive black hole at the heart of a distant galaxy was confirmed by blasts of energy caused as it plunges through a disk of gas and dust around its larger companion.
TroibNews 
A second supermassive black hole at the heart of a distant galaxy was confirmed by blasts of energy caused as it plunges through a disk of gas and dust around its larger companion.
