Just to clarify, the mass of an object bends space-time and the amount of the bending communicates how much acceleration/gravity other objects experience when near that object. At least that's the general relativity explanation. On very tiny scales a new theory is needed.
Trust me, I have a PHD from the Greater Correspondence College of Tampa with a minor in VCR repair.
Speaking of black holes, when I was a kid, a friend and I rented a porno called "Hot Black Holes" on his mom's video card. When she saw the receipt she asked what it was and I got all all nervous and then my friend replied it was an educational movie about space.
