Mars Exploration Rover Program Manager John Callas

Published Nov 19, 2007, 6:00 AM
John Callas provides a status report on Spirit and Opportunity. Emily Lakdawalla is looking at brilliant Comet Holmes in her Q&A report, and Bruce Betts also makes room for Holmes in his What's Up! review of the night sky.Learn more about your ad choices. Visit megaphone.fm/adchoices

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Planetary Radio: Space Exploration, Astronomy and Science

Planetary Radio brings you the human adventure across our solar system and beyond. We visit each wee 
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