Dr. Michael Busch talks about the strange, low gravity surfaces of asteroids, and the challenges a visiting astronaut might face.
Dr. Britney Schmidt tells us about how she can learn about they icy, watery moon Europa by exploring giant Antarctic ice shelves with submarines.
Dr Jeff Rich talks about where elements come from, and the famous phrase, "We are all made of star stuff".
Dr. Linda Spilker discusses the Cassini Spacecraft; what it looks like, what it has discovered, and plans for the conclusion of the mission.