Hierarchy:
Description:
{{astronomy|obsolete}} A hypothetical tenth planet, beyond Pluto {{qualifier|Pluto was demoted to minor planet status as a dwarf planet, so there are only eight planets. It had been applied to Eris for a short while.}}
Ngram:
Ngram Text:
Planet X
Source:
Wiktionary
Issue:
0
Ngram Count:
2
Wikokit WikiText ID:
136171