WHEN TWO BLACK HOLES COLLIDE, THEY FORM AN EVEN MORE MASSIVE BLACK HOLE

It’s likely that the supermassive black holes at the centres of galaxies began to form early in the evolution of the universe. As matter condensed to form the first galaxies, it would have been much closer together, and small black holes would have been able to feast on dust and gas, becoming truly massive in a very short space of time. Several intermediate black holes are thought to have formed within clusters of stars before sinking towards the centres of galaxies under the influence of each other’s gravitational pull, collapsing in on one another to form the supermassive giants that we see today.