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  • 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)
    • Soon after, the android servitors enter a state of hibernation, leaving Ruk as a sentinel to awaken them when other humanoids arrive (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?")
  • March 2266: USS Enterprise arrives, following up on the last known location of Roger Korby (TOS: "What Are Little Girls Made Of?")
  • c.2305: Small expedition of Emil Vaslovik, Ira Graves, and Noonien Soong arrives, investigating the results of the USS Enterprise investigation and inadvertently awakening the Exo III androids in the process. (TNG Novel: Immortal Coil)