Word.ws English Dictionary

Planet 9

Planet 9 is the alternative form of Planet Nine.

Meaning of Planet Nine

Proper noun

Planet Nine

  1. 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.

Questions about Planet 9

What is Planet 9 the alternative form of?
Planet 9 is the alternative form of Planet Nine.

Words near Planet 9 in the dictionary

  1. planespotting
  2. planest
  3. planeswalker
  4. planeswalkers
  5. planet
  6. Planet 9
  7. Planet Earth
  8. planet gear
  9. planet gears
  10. Planet Genesis
  11. Planet IX

Source and license

Adapted from Wiktionary: Planet 9 (page history and authors); Planet Nine (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “Planet 9.” Word.ws, https://word.ws/planet_9. Based on Wiktionary, CC BY-SA 4.0.