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Black holes, killer asteroids and why Pluto wasn't a planet

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Neil deGrasse Tyson
Neil deGrasse Tyson, director of New York City's Hayden Planetarium and host of public television's "NOVA scienceNOW," speaks in July in Pasadena, Calif.
Photo by Frederick M. Brown/Getty Images
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Neil deGrasse Tyson
Neil deGrasse Tyson, director of New York City's Hayden Planetarium and host of public television's "NOVA scienceNOW," speaks in July in Pasadena, Calif.
Photo by Frederick M. Brown/Getty Images