An artist’s illustration of a potential Planet Nine
Mark Garlick/Science Photo Library/Alamy
If the solar system does have a Planet Nine, it’s a world that was bullied by its bigger siblings, exiled to the far reaches of house and solely rescued from oblivion due to the intervention of passing stars.
Planet Nine is a hypothesised planet that’s 5 to 10 occasions the mass of Earth, orbiting in the outer solar system at about 400 to 800 occasions the Earth-sun distance. The finest proof for its existence comes from a clustering of objects orbiting far from the solar,…