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NEW YORK, NEW YORK - APRIL 12: Cosmologist Stephen Hawking attends the New Space Exploration Initiative 'Breakthrough Starshot' Announcement at One World Observatory on April 12, 2016 in New York City. (Photo by Gary Gershoff/WireImage)

NEW YORK, NEW YORK - APRIL 12:  Cosmologist Stephen Hawking attends the New Space Exploration Initiative 'Breakthrough Starshot' Announcement at One World Observatory on April 12, 2016 in New York City.  (Photo by Gary Gershoff/WireImage)