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<p>On March 14, 2018, famed theoretical physicist and cosmologist <a href=Stephen Hawking died at his home in Cambridge, England at the age of 76. Hawking was a celebrity both in the science community and in the public eye. His 1988 book "A Brief History of Time" sold over 10 million copies.    

In this photo from 2008, Hawking delivers a speech entitled "Why we should go into space" during a NASA lecture series.

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