Planet 9 is a hypothetical planet in the outer Solar System. Its gravitational influence could explain the abnormal orbits of a group of trans-Neptunian objects (TNOs) found mostly beyond the Kuiper belt.
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Planet 9 is a hypothetical planet in the outer Solar System. Its gravitational influence could explain the abnormal orbits of a group of trans-Neptunian objects (TNOs) found mostly beyond the Kuiper belt.