Astrophysicist Tyson On 'Pluto Files'

Published February 13, 2009 at 10:00 AM EST

The director of the American Museum of Natural History's Hayden Planetarium and author of The Pluto Files, Neil deGrasse Tyson, talks about the future of NASA, Pluto's demotion to dwarf-planet status, and the difference between Darwin and Einstein.

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