A '''SectorsSector''' is a measurement of space used by the [[Imperium]]. They are divisions of a [[segmentum|SegmentaSegmentum]]. The size of a sector varies according to local demands and stellar density. A typical sector might encompass 7 million cubic light years, but are usually equivalent to a cube with sides almost 200 light years long. Sectors are in turn divided into ''subsectors''.¹

Sectors are in turn divided into '''Subsectors''' usually comprise between 2 and 8 star systems within a 10 , which range from ten to twenty light year radius (some may encompass more systems - others only 1)years in diameter. This size is governed by the practical patrol ranges Subsectors, rather than being general blocks of space, are instead centered on densely populated star clusters, important worlds, or meeting points of spaceships[[warp]] trade routes. Because, unlike ¹ The areas between sectors, and subsectors are divisions vast, in fact making up more of worlds (rather the galaxy than volumes of space) there the Imperium controls, and are often unexplored, uninhabited, alien empires, or inaccessible by the warp ¹. There are vast numbers a huge number of [[System|star systems]] within each sector which that do not fall within a subsector. These zones are referred to as inter sectors - and are commonly known as by various names including [[Wilderness Space]] or wilderness zones¹, inter sectors, forbidden zones, empty space and , or frontier space. Inter-sectors may contain gas or dust nebulae, inaccessible areas, alien systems, unexplored systems, uninhabited systems and uninhabitable worlds.