The Limit of the Size of the Black Hole

There's a limit on how big a black hole you can get that comes from a star, see? But the limit is smaller than the biggest star. So the biggest stars can be 300 times the mass of our sun - but only those who go up to 80 are very rare. And we see lots of those black holes around the universe. That's the kind of lower range of black holes. And then there'sk the upper range of blackholes. These are just really enormous, and they reallyk drive the gravity of a galaxy. We have one like this at the centre of our galaxy.