This episode covers the moon, and in particular, its creation. We talk to the two scientists who came up with the theory of the moon's creation that is still prevalent today: Don Davis and Bill Hartmann In the episode we discuss in detail their theory that the moon has been created by an impact event into earth, as well as some of the history of this theory. We also discuss other space related topics such as water on the moon, human vs. robotic space flight, and flights to Mars.