Late in 2021 a team of space scientists published a paper in The Annual Review of Astronomy and Astrophysics suggesting that there may be an Earth- or Mars-sized planet orbiting beyond Neptune. They further suggest that simulations of the creation of the solar system show that such a planet may have been pushed from the outer regions of the solar system by Neptune and Uranus. Over the years, there have been several reports of large objects in the Kuiper belt (ie., Pluto and Eris), but until the Batygin and Brown discovery, none have been heavy enough to contend for the title of 'Planet X'. Poste