"Revealing 'Planet 9': A Potential Challenge to Gravity's Theory"

Evidence for the existence of a ninth planet in our solar system, known as Planet 9, may actually indicate that our understanding of gravity is incomplete. Scientists studying the effect of the wider Milky Way galaxy on objects in the outer edges of the solar system have found that the behavior of these objects could be explained by a theory called Modified Newtonian Dynamics (MOND), which suggests a different type of gravitational behavior under great rotational velocities. This challenges the need for dark matter to explain galactic structures. The strange behavior of objects in the Kuiper belt, which is believed to be caused by Planet 9, could also be explained by MOND. However, the scientists caution that more research is needed to confirm their findings.