Planet Nine 2025. Planet nine, also known as planet x, is a theoretical planet that is rumored to exist in the outer solar system. Gravitational anomalies along with unusual orbital patterns in the kuiper belt have triggered debate over the existence of planet nine.
Image via solen feyissa/ unsplash. Researchers closely tracked and computationally analyzed moon and asteroid sized objects beyond neptune and determined that a ninth planet about five times bigger than the earth is about 16 times further than pluto.