So what happens when two Super Massive Black Holes collide? We may be about to find out, because astronomers have spotted a pair of them in a close binary orbit for the very first time.
This episode of Space Time Journal Club discusses: «A candidate sub-parsec binary black hole in the Seyfert galaxy NGC 7674», Kharb, Lal & Merritt 2017 https://arxiv.org/abs/1709.06258
