Jupiter, Saturn, Uranus, or Neptune may have sent the Earth-sized planet barreling toward deep space.
Scientists believe that there could be a ninth planet in our solar system, lurking somewhere beyond Neptune—but don’t get too excited, because this isn’t about Pluto.
Rather, this is the story of a mysterious Earth-or Mars-sized planet that may have swirled beyond the asteroid belt, among the gas giants, before they ultimately swept this potential “Planet 9” toward the outer reaches of our solar system… or even into deep space. The theory makes sense on its face: Jupiter is kind of known as a bully, after all.