Definitions from Wiktionary (Planet 9)
▸ noun: (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: (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 Nine,
Planet X,
planet,
exoplanet,
major planet,
kuiperoid,
Trojan planet,
Kuiper belt,
dwarf planet,
plutino,
more...
Opposite:
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▸ Words similar to Planet 9
▸ Usage examples for Planet 9
▸ Idioms related to Planet 9
▸ Wikipedia articles (New!)
▸ Words that often appear near Planet 9
▸ Rhymes of Planet 9
▸ Invented words related to Planet 9