spectroscopist and Deep Impact co-investigator, University of Maryland
Deputy Principal Investigator Jessica Sunshine returns to share her excitement about the Deep Impact spacecraft's flyby of Hartley 2, the most active comet ever observed up close. Emily Lakdawalla on the bits of asteroid dust collected by Hayabusa. Bill Nye the Science and Planetary Guy salutes the launch of Nanosail-D. Bruce Betts and Mat Kaplan are immortalized in a new What's Up song created by a listener. That's just before they offer a new space trivia contest.