No Escape: Dive Into a Black Hole (Infographic) by Karl Tate - When matter is compressed beyond a certain density, a black hole is created. It is called black because no light can escape from it. Some black holes are the tombstones of what were once massive stars. An enormous black hole is thought to lurk at the center of the Milky Way galaxy.
If you were to take a step into a small black hole, your body would most closely resemble toothpaste being extruded out of the tube. Tidal forces are so strong at a black hole's threshold (called the "event horizon") that they would stretch your body into a string of atoms as you fell into the abyss. But if you fell into a somewhat larger black hole with less extreme tides, you could maintain your internal structure. Einstein's theory of time dilation suggests that if you looked forward…
A binary black hole system, viewed edge-on. This pair of extremely dense objects twists and warps spacetime as the two black holes spiral in toward one another. Image Credit: Bohn, Throwe, Hébert, Henriksson, Bunandar, Taylor, Scheel (see http://www.black-holes.org/lensing) via: http://www.universetoday.com/116500/new-simulation-offers-stunning-images-of-black-hole-merger/
UPDATE: Hawking’s new suggestion is that the apparent horizon is the real boundary–a place that grows or shrinks according to how much matter is consumed or radiation is given off. Ultimately, as Hawking writes, “The absence of event horizons means that there are no black holes — in the sense of regimes from which light can’t escape to infinity.” - Credit: NASA - Read more: http://www.fromquarkstoquasars.com/stephen-hawking-bombshell-black-holes-as-we-know-them-do-not-exist/