A is for "Amazing Grace," played at Spock's funeral proceeding.
B is for Beta Niobe. The star that went supernova and destroyed it's only planet; Sarpeidon. Home the Mr Atoz and his amazing Atavachron.
C is for the Crab Nebula.
D is for Deneb IV, a planet visited by both Kirk and Picard.
E is for the Enterprise-B's rescue mission to save El-Aurian refugees trapped in the leading edge of the Nexus Ribbon. It was during this mission that James T. Kirk was believed killed.