More From JPL's Linda and Tom Spilker

The couple that explores space together continues their conversation with host Mat Kaplan. Linda and Tom are part of a team that has proposed the first mission to Neptune since Voyager. They also talk about how missions get started, and how they've balanced family with long hours at the Jet Propulsion Laboratory. Bill Nye describes yet another way our presence in space is helping us to save the Earth. Emily Lakdawalla clears up a Q&A question about our moon, and Bruce Betts hobnobs with the real stars on What's Up. He and Mat also have announce a new space trivia contest.