Planet 9
Planet Nine spacepedia
Artist's impression of Planet Nine.
Date of Discovery Claimed
Planet nine-etnos now-new2

The orbit of 2015 KG163 (right side, in orange) and other extreme detached objects, along with the hypothetical Planet Nine's orbit on the right

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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