Forum discusses NASA's Deep Impact mission, and what scientists hope to learn from the spacecraft's collision with Comet Tempel 1.
Deep Impact Mission
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Andrew Fraknoi, chair of the Astronomy Program at Foothill College
David Morrison, chief of the Space Science Division at NASA's Ames Research Center
Todd Barber, jet propulsion engineer at NASA's Jet Propulsion Laboratory at the California Institute of Technology in Pasadena