Mars Exploration Rover Program Manager John Callas
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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 See omnystudio.com/listener) for privacy information.

See omnystudio.com/listener) for privacy information.