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NASA Comet Discoveries and Encounters
NASA Comet Discoveries and Encounters
17 Nov 2010
(Source: NASA)

Watch Dr. James Green, director of NASA's Planetary Science Division, and other experts discuss the history of comet exploration on the 25th anniversary of the first comet encounter at a September 10, 2010 symposium at the Newseum in Washington, D.C.

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Last Updated: 17 Nov 2010