Black Holes… These monstrous and seemingly voids of black space suck in everything that gets too close to them; space dust, asteroids, planets, and even entire stars. The nearest one is 1,600 light-years from us. And in the region of the Universe visible from the Earth, there are perhaps 100 billion galaxies. Each one has around 100 million stellar-mass black holes in the center, ready to devour anything that gets close enough to its event horizon. But what would happen if all the black holes in the universe collided? Keep watching to find out.