Photo: #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.
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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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Black holes, killer asteroids and why Pluto wasn't a planet

Broadcast: Midday, 03/16/2007, 12:06 p.m.

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Astrophysicist Neil deGrasse Tyson started the movement to strip Pluto of its planetary status. Now he's out with a new book, "Death By Black Hole and other Cosmic Quandaries." Tyson spoke in February at the Commonwealth Club of California.

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