Re: Massive black hole?
It all depends on how you're defining the black hole - are you referring to the quantum singularity at the middle where the volume is effectively nothing but the mass is ridiculously high, or are you referring to the volume of space contained within the event horizon? IIRC, the average density of a black hole with a volume of the known universe, would roughly be the average density of the known universe.
Biting the hand that feeds IT
