Tracing the Solar System's Origins in Comet Dust

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In 2004, NASA's Stardust mission stole microscopic rocks from a comet's tail. Last week, scientists released their first analysis of the alien particles. We discuss what comets can tell us about life and how our solar system formed.


Don Brownlee, principal investigator for NASA's Stardust Mission; professor of astronomy at the University of Washington in Seattle, Washington



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