"Planet Nine" gives audiences an inside look at the painstaking process of planet-searching, as told by CalTech's Mike Brown, discoverer of Eris and Haumea. Throughout this fascinating show, Brown talks about unusual orbits and describes nights of painstaking robotic searches for new planets. His is a story of modern planet-hunting techniques that have uncovered many new worlds out beyond Neptune. Discoveries of new worlds "out there" also give insight into their distances, orbits, and compositions. In addition, those orbits give intriguing clues to the existence of what may be a very large, so-far-undiscovered world deep in the Kuiper Belt. Join in this fascinating tale of observation, discovery, and analysis -- and hear firsthand about the life of a modern planet hunter searching out his prey.