Exo III

Facts

Primary: Exo
Class P
- Formerly Class M c.500,000ya (TOS: "What Are Little Girls Made Of?")
Uninhabited (TOS: "What Are Little Girls Made Of?")
- Formerly inhabited by Old Ones (TOS: "What Are Little Girls Made Of?")

c.500,000ya: The dimming of Exo results in the surface of Exo III becoming uninhabitable (TOS: "What Are Little Girls Made Of?")
- The Old Ones retreat underground, eventually going extinct at the hands of their android servitors (TOS: "What Are Little Girls Made Of?"; TNG Novel: Immortal Coil)
2261: Expedition led by Roger Korby arrives at Exo III to study ruins of former inhabitants (TOS Novel: Errand of Vengeance: The Edge of the Sword; TOS: "What Are Little Girls Made Of?")