Hate to be "that guy", but um....
Steven Bogos said:
...a black hole, which is a vacuum with intense gravity.
Mmmmm, no. That's not what a black hole is.
http://en.wikipedia.org/wiki/Black_hole
A black hole is essentially gravity gone mad. In fact, given the density of the matter within the singularity, a black hole may very well be the least vacuous thing in the universe.