"Simulations Suggest Earth-Sized Planet May Exist at Solar System's Edge"

Computer simulations conducted by researchers in Japan suggest the existence of a hidden Earth-sized planet at the edge of the solar system, orbiting about 200 au from the Sun. The simulations explain unexplained phenomena associated with trans-Neptunian objects (TNOs) in the Kuiper Belt, such as the presence of detached objects and highly inclined orbits. While the proposed planet is smaller and closer to the Sun than the previously proposed "Planet Nine," it could explain these TNO phenomena. The planet's distance from the Sun would result in very cold surface temperatures, but it could potentially have subsurface oceans, volcanoes that erupt ice, and other geological features. The research has caught the interest of planetary scientists, although the precise location of the planet remains unknown.