Star Cluster One is a play-by-mail game published by The Buchanan Company.
[1] Star Cluster One was a game in which players built bases and ships to take over a star cluster recovering from a recent super-nova.
[2] Exploration using diplomacy and intrigue to discover habitable worlds was part of gameplay.
Armintrout reviewed Star Cluster One in The Space Gamer No.
Right now it is a slow game with a long turn-around time - hardly the perfect combination.