A Sector is a measurement of space used by the Imperium. They are divisions of a Segmentum. The size of a sector varies according to local demands and stellar density, but are usually equivalent to a cube with sides 200 light years long. A naval Battlefleet of warships defend each sector. The Sectors themselves are overseen by Sector Lords.

星域是帝国使用的空间的度量。它们是星域的分支。星区的大小根据当地需求和恒星密度而变化，但通常相当于边长为200光年的立方体。一支由战舰组成的海军战斗舰队保卫着每个星区。星区本身由星区领主监督。

Sectors are in turn divided into Subsectors (or Sub-Sectors), which range from ten to twenty light years in diameter. Subsectors, rather than being general blocks of space like sectors, are instead centred on densely populated star clusters, important worlds, or meeting points of warp trade routes.

星区又分为直径在10到20光年之间的分星区（或分区）。分区，而不是像星区的空间那样的一般块，而是以人口稠密的星群、重要世界或亚空间贸易路线的交汇点为中心。

The areas between sectors and subsectors are vast, in fact making up more of the Galaxy than the Imperium controls. They are often unexplored, uninhabited, alien empires, or inaccessible by the warp. These zones are known by various names including Wilderness Space or wilderness zones, inter sectors, forbidden zones, empty space, or frontier space.

星区和分区之间的区域很大，事实上，它们在银河系中所占的比例比帝国控制的要大。它们往往是未经探索的、无人居住的、陌生的帝国，或者是亚空间无法到达的。这些区域有各种各样的名称，包括荒野空域或荒野区、埋葬星区、禁区、空区或边境空域。