Planet Nine en · PROPN
Meanings
- 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.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| Planet 9 | alternative | lexicographic | |
| Planet IX | alternative | lexicographic |