User:Domduder/sandbox

An Ultramassive Black Hole is the largest category of black holes, weighing 10 to 40 billion solar masses. The origins of these black holes are are unknown, as they are too big to be created from a black hole eating stars or colliding with other black holes. One hypothesis is that these black holes were formed from a Quasi-star, a hypothetical star that existed in the early history of the universe, which had black holes in their center. One example of an ultramassive black hole is the biggest discovered black hole, TON 618. TON 618 is the biggest black hole ever discovered, weighing in at 66 billion solar masses.