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)