Mars Exploration Rover Program Manager John Callas

Hard to believe it has been almost four years (and two Martian years) since the first Mars Exploration Rover crawled onto the surface of the Red Planet. John Callas of JPL provides a status report on Spirit and Opportunity. Emily Lakdawalla is looking at brilliant Comet Holmes in her Q&A report. Bruce Betts also makes room for Holmes in his What's Up! review of the night sky. Bruce and Mat Kaplan announce a new space trivia question.