- For other uses, see class C.
In planetary classification, a class C geoinactive planet is a type of planet. As the name describes, the planet is generally geothermally inactive, generating no heat energy. This type of planet is usually in the very late stages of development and has likely evolved from other classes. No lifeforms have ever been discovered on these planets. (ST reference: Star Charts)
- This classification should not be confused with the class C reducing planet described in ST references: Star Trek Maps, The Worlds of the Federation.