Stephen Hawking NASA 50th (200804210010HQ)

Dr. Stephen Hawking, a professor of mathematics at the University of Cambridge, delivers a speech entitled "Why we should go into space" during a lecture that is part of a series honoring NASA's 50th Anniversary, Monday, April 21, 2008, at George Washington University's Morton Auditorium in Washington. Photo Credit: (NASA/Paul E. Alers)

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Taken on April 21, 2008