Summary:
- The article discusses a new study that has found evidence of a ninth planet in our solar system, beyond the orbit of Neptune.
- The study, published in the Astronomical Journal, suggests this hypothetical planet has a mass about 10 times that of Earth and orbits the Sun at a distance of about 400 times the Earth-Sun distance.
- The researchers used mathematical modeling and computer simulations to infer the existence of this distant planet, based on its gravitational effects on other objects in the outer solar system.