The size of a black hole’s event horizon is pretty much directly correlated to its mass; I think the only thing that really modifies it in practice is very fast

The size of a black hole’s event horizon is pretty much directly correlated to its mass; I think the only thing that really modifies it in practice is very fast rotation. (Remember, it’s a phenomenon of gravity, not a physical object. The physical stuff inside is just some really intense matter squeezed together in ways that might be interesting, if they were observable.)