Scientists have narrowed down the likely hiding place of the elusive "Planet Nine," after ruling out more than three-quarters of the hypothetical world's suspected orbital pathway. In a new study, the researchers — who have been looking for the planet for almost a decade — said they believe they could find the elusive world in the next few years.
Planet Nine, also known as Planet X, is a theoretical planet that is rumored to exist in the outer solar system. The Planet Nine hypothesis was first proposed in 2016 by Caltech astronomers Michael Brown and Konstantin Batygin. The pair put forward their hypothesis after other astronomers detected a series of objects in the Kuiper Belt — a large disk of asteroids and comets beyond the orbit of Neptune — that had unusually warped orbits around the sun. After analyzing these objects, Brown and Batygin decided that only a massive planet's gravitational pull could explain the orbital anomalies.
