Phil Christensen Explores Mars in the Infrared

Planetary geologist Phil Christensen heads Arizona State University's Mars Space Flight Facility, and leads the exploration of Mars through infrared spectrometry. He shares what he has learned with the Planetary Radio audience. Emily Lakdawalla wonders where those ancient Martian floodwaters went, while What's Up? with Bruce Betts has more news of the solar system and the new trivia contest.