Trans-Neptunian object
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Trans-Neptunian object or TNO is a name astronomers give to any minor planet in the Solar System which orbits (goes around) the Sun beyond the planet Neptune. There are over a thousand of them.[1] Many are in the Kuiper belt.
Trans-Neptunian Object Media
Pluto imaged by New Horizons
Euler diagram showing the types of bodies in the Solar System.
Size comparison between the Moon, Neptune's moon Triton, Pluto, several large TNOs, and the asteroid Ceres. Their respective shapes are not represented.