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Meaning of Planet 9 | Babel Free

Noun CEFR B2

Definitions

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.

CEFR level

B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

Planet Earth planet gear Planet Genesis Planet Methuselah planet placement Planet Thanet

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