The Envelope Please: Choosing the 2007 Mars Scout Mission, Part 2

Planetary Radio concludes its examination of the Mars Scout finalists. Up this week are Joel Levine, Principal Investigator for ARES, the Mars airplane, and Mark Allen, PI for MARVEL, a life-seeking orbiter. Biff Starling and Sandy Moondust also drop in on What's Up!, while Emily explores Jupiter's wild color palette.