According to Einstein’s theory of general relativity, black holes are regions of space where gravity is so strong that not even light can escape. In the 70’s Stephen Hawking asserted that any information sucked inside a black hole would be permanently lost. But now, researchers have shown that information can be recovered from black holes
http://www.universetoday.com/2008/05/15/how-to-escape-from-a-black-hole/