Key Speakers At The 28th National Space Symposium [Getty Images]

Neil deGrasse Tyson, director of the Hayden Planetarium, speaks during the 28th National Space Symposium in Colorado Springs, Colorado, U.S., on Tuesday, April 17, 2012. The National Space Symposium is a gathering of the global space community to advance space-related endeavors. Photographer: Matthew Staver/Bloomberg via Getty Images

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