The Gemini Server is the only remaining server in the persistent world game of PlanetSide. It is the result of a consolidation of a number of other servers which were slowly deactivated after their populations began to diminish. The last servers were Emerald, Johari, Konreid, Markov, and Werner (more information needed).
Eventually the population diminished such that these servers were deactivated and the player base was moved to the Gemini Server. This server has actually seen a slight rise in player population due to the news and screen shots of the impending release of PlanetSide 2.