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Planet 9. In DICTIOUS you will not only get to know all the dictionary meanings for the word
Planet 9, but we will also tell you about its etymology, its characteristics and you will know how to say
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English
Proper noun
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.