Planet Nine is another hypothetical planet lurking somewhere in our solar system. Unlike Nibiru, NASA and astronomers from the California Institute of Technology think that Planet Nine could exist, although there is no verifiable evidence that it does. Astronomers speculated the existence of Planet Nine after observing the irregular orbits of five solar objects far beyond Neptune.
Astronomers think that Planet Nine is the same size as Uranus or Neptune, has a mass 10 times that of Earth, and is 20 times farther from the Sun than Neptune. They believe that Planet Nine takes 10,000–20,000 years to complete a revolution around the Sun.[