Black hole question

1. Sep 11, 2003

photon

Why is it said that a black hole is a literally bottemless pit in space-time? If it weren't bottemless, then the singularity inside would not have to be of infinite density.

2. Sep 11, 2003

HallsofIvy

Staff Emeritus
Yes, but a black hole is, by definition, of infinite density.\\

Well, the way you are putting it, that's true. In general, a black hole only has to be massive enough that light cannot escape it. (It's "escape velocity" is greater than the speed of light.)

A large (in volume) black hole would not have to have infinite density and would not be "a literally bottemless pit in space-time".

3. Sep 11, 2003

bogdan

What do you mean by "density" ?
Huh ?
mass/volume ?
mass=finite
volume<>0...(the radius of the horizon is not 0...)
so density is not infinite...or am I wrong ?

4. Sep 12, 2003

meister

I think he was talking about the singularity's density.