A GREAT SCIENTIST STEPHEN WILLIAM HAWKING

Stephen hawking is a great scientist of the world now.He was born in 1942 in educated family.Stephen William Hawking, is an English theoretical physicist and cosmologist, whose scientific books and public appearances have made him an academic celebrity. He is an Honorary Fellow of the Royal Society of Arts,  a lifetime member of the Pontifical Academy of Sciences,  and in 2009 was awarded the Presidential Medal of Freedom, the highest civilian award in the United States.

Albert einstein award for theoreticl physical at the age of 32.He was confined to the wheelchair in 1972.He 
can speak only through a computer.He lives with wife three daughters.Hawking was in the news in July 2004 for presenting a new theory about black holes which goes against his own long-held belief about their behaviour, thus losing a bet he made with Kip Thorne and John Preskill of Caltech. Classically, it can be shown that information crossing the event horizon of a black hole is lost to our universe, and that thus all black holes are identical beyond their mass, electrical charge and angular velocity (the "no hair theorem"). The problem with this theorem is that it implies the black hole will emit the same radiation regardless of what goes into it, and as a consequence that if a pure quantum state is thrown into a black hole, an "ordinary" mixed state will be returned. This runs counter to the rules of quantum mechanics and is known as the black hole information paradox

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