Stephen Hawking dies aged 76

He died peacefully at his home in Cambridge in the early hours of Wednesday, his family said.
 The Briton  wrote several popular science books including A Brief History of Time.
 Prof Hawking was the first to set out a theory of cosmology as a union of relativity and quantum mechanics. He also discovered that black holes leak energy and fade to nothing - a phenomenon that would later become known as Hawking radiation.
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