The game board is comprised of Zones, empty spaces where each Sector can be placed during the game with the Explore Action (see the Explore: Overview section of the Action Phase section for details on Exploring). Zones and Sectors are grouped into Rings: Inner (I), Middle (II), and Outer (III). This corresponds to their distance from the Galactic Center Sector in the middle of the board. Rings are used to determine which type of Sector is revealed when Exploring a Zone during the Explore Action.