If all black holes are made up of an infinitely small point with infinite density, why are there “big” black holes and “small” black holes?

Question

If all black holes are made up of an infinitely small point with infinite density, why are there “big” black holes and “small” black holes?

In: 2

Answer 1

That point isn’t what we “see”, we see the event horizon. The point at which not even light can escape. Any light that would have passed any closer than that gets sucked in, any light that passes around it gets bent a lot (see gravitational lensing) but still escapes.

Fun fact: due to time dilation, the lowest energy orbit you can have around a black hole is 1.5x the Schwarzchild radius (distance from the center to the event horizon) to get any closer or further away from the black hole, you would need to add energy to your orbit, so it’s actually a stable orbit.