Controversially re-classified as a dwarf planet. Covered in glaciers, mountains of water ice, dunes, and possibly volcanoes of water, methane, or ammonia. Learn More.
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A Solar System object whose existence was proposed in 2016. Estimated to be ten times larger than Earth and orbits farther from the Sun than Pluto. Has not been visually observed, but there is evidence for its existence based on gravitational effects seen in the far reaches of the Solar System. Learn More.