"Abandon all hope, ye who enter here." The Italian poet Dante Alighieri wrote these words in his fourteenth century poem Inferno about a journey through hell. The same foreboding could apply to black holes.

If anything gets too close to a black hole, it is dragged inside and never leaves. This is because a black hole's gravity is so strong that even light cannot escape. Click ahead and learn a few facts about these eerie formations in space.