- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
A nebula of young stars near Betazed -- at least 15 hours' travel at unspecified warp -- that had been unmapped by the Federation until 2366. Its emissions interfere with subspace commuication, a normal occurrence for such a phenomenon. The mapping assignment was so routine that Captain Picard allowed Commander Riker and Counselor Troi to take leave on Betazed until it was finished.