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From Warhammer 40k - Lexicanum
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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.<sup>1</sup>
Sectors are in turn divided into '''Subsectors''', which range from ten to twenty light years in diameter. Subsectors, rather than being general blocks of spacelike sectors, are instead centered on densely populated star clusters, important worlds, or meeting points of [[warp]] trade routes.<sup>1</sup>
The areas between sectors and subsectors are vast, in fact making up more of the galaxy than the Imperium controls, and are often unexplored, uninhabited, alien empires, or inaccessible by the warp <sup>1</sup>. There are a huge number of [[System|star systems]] that do not fall within a subsector. These zones are known by various names including [[Wilderness Space]] or wilderness zones <sup>1</sup>, inter sectors, forbidden zones, empty space, or frontier space.
