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Scientists just found a dozen new moons around Jupiter — including one they’re calling an ‘oddball’

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.
An illustration of Planet X, which is sometimes called Planet Nine.

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?