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The researchers that discovered Jupiter's moons were searching for a hypothetical massive planet that might exist at the far fringes of our solar system, often referred to as Planet Nine or Planet X.
Is it Planet 9 or Planet X? Scientists spar over what to call the solar system’s hypothetical missing world
Increasing indirect evidence suggests a missing planet in the solar system may lurk beyond Pluto. Astronomers are hunting for it, but leading scientists are in a dispute over what to call the world: Planet 9 or Planet X?
They've got two lines of evidence to back the claim.