Is there an upper limit to the size of a black hole?

Black holes have a size limit of 50 billion suns. By Joshua Sokol. Even gluttons can't eat forever. When black holes at the hearts of galaxies swell to 50 billion times the mass of our sun, they may lose the discs of gas they use as cosmic feedlots. Most galaxies host a supermassive black hole at their centre. read more

The upper limit to the size a black hole is a black hole with the total mass of the universe. The bigger the black hole, the cooler it is. When it gets to the temperature of 4 degrees K it is in thermal equilibrium with the cosmic background radiation, which is the echo of the Big Bang. read more

Without a disc, the black hole would stop growing, making this the upper limit. The only way it could grow larger would be if a star fell straight in or another black hole merged with it. But neither process would fatten it up as efficiently as a gas disc. read more

There appears to be an upper limit to how big the universe's most massive black holes can get, according to new research led by a Yale University astrophysicist. Once considered rare and exotic objects, black holes are now known to exist throughout the universe, with the largest and most massive found at the centers of the largest galaxies. read more