Definitions from Wiktionary (Planet Nine)
▸ noun: Alternative form of Planet 9 [(astronomy) A theoretical ninth planet in the Solar system, the gravitational effects of which would explain the improbable orbital configuration of a group of trans-Neptunian objects that orbit mostly beyond the Kuiper belt.]
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▸ noun: Alternative form of Planet 9 [(astronomy) A theoretical ninth planet in the Solar system, the gravitational effects of which would explain the improbable orbital configuration of a group of trans-Neptunian objects that orbit mostly beyond the Kuiper belt.]
Similar:
Planet 9,
Planet X,
outer planet,
exo-planet,
Neptune,
exosolar planet,
Pluto,
Sol IX,
planet,
trans-Neptunian object,
more...
Types:
▸ Words similar to Planet Nine
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▸ Wikipedia articles (New!)
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▸ Invented words related to Planet Nine