Alan Stern's Biggest Planetary Science Mysteries

Planetary scientist and New Horizons Principal Investigator Alan Stern recently came up with his list of the biggest unanswered questions in planetary science. He reviews most of them on this week's show. Bill Nye is caught at the airport returning from the Federation of Galaxy Explorer's annual ball. A classic Q&A from Emily Lakdawalla prepares us for the Saturnian equinox. Bruce Betts calls in his What's Up report from Virginia where he was helping to prepare the LIFE experiment for a trip to Phobos. It didn't keep him and Mat Kaplan from offering a new new space trivia contest.