The Mysterious Ninth Planet

Since Pluto was demoted, astronomers have been searching for the ninth planet in the solar system. The weird orbital clusters of Kuiper Belt objects have given new life to the "Planet X" hypothesis. Is it an ice giant with a mass about 5-10 times that of Earth? Or a wandering black hole? Or is it the creation of an alien civilization? Follow the deep space exploration team and uncover the truth behind this mysterious celestial body at the edge of the solar system.