Lucy Mission Principal Investigator, Southwest Research Institute
A computer model indicates that most of the comets in the vast Oort Cloud were stolen by the Sun billions of years ago. The Southwest Research Institute's Hal Levison describes his team's findings. Emily Lakdawalla is concerned about a Mars rover press release from NASA. Bill Nye considers the reality of gravity. Bruce Betts and Mat Kaplan find a spot in the What's Up? space trivia contest for Lindsay Lohan.