Mars Exploration Rover Project Manager John Callas

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Published Jul 27, 2009, 5:00 AM
John Callas reports on Spirit and Opportunity, Bill Nye debates the future of humans on the Moon, and Bruce Betts looks to the Perseid meteor shower 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 brings you the human adventure across our solar system and beyond. We visit each wee 
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