NASA Astronomer Steven Squyres
He's the principal scientific investigator for the twin rovers, Spirit and Opportunity, on Mars. The two landed on the surface of Mars in January, and are helping astronomers to determine whether or not there was life on the planet. Squyres will talk about the many gadgets they created to work on Mars, and what it's like working on "Mars time." Squyres is also a professor of astronomy at Cornell University.

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