Formed when a massive star collapses from its own gravity, black holes have such a strong pull of gravity that not even light can escape from them.
Today's scientists believe that a black hole is the end product in the lifecycle of a giant star. If this star is three or four times as massive as our own sun, even after it has exhausted all its fuel, then it can collapse under its own gravity. Just like a crab burying itself at the beach and pulling the sand down over itself, the collapsing star pulls in everything around it as well.
These Black Holes pictures are from the Hubble Space Telescope.
 Black Hole in Galaxy M87 Emits Jet of High-Speed Electrons |  A Dying Star in Globular Cluster M15 |  A Cosmic Searchlight |
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