Sectors are in turn divided into A '''SubsectorsSector'''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, which range from ten but are usually equivalent to twenty a cube with sides 200 light years in diameterlong. Subsectors, rather than being general blocks A naval [[Battlefleet]] of space like sectors, warships defend each sector.{{Fn|1}} The Sectors themselves are instead centered on densely populated star clusters, important worlds, or meeting points of overseen by [[warpSector Lord]] trade routess.¹{{Fn|2}}

Sectors are in turn divided into [[Subsector]]s (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.{{Fn|1}} 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 ^,{{Fn|1, }} inter sectors, forbidden zones, empty space, or frontier space. ==See also==*[[List of sectors]]

*^{{Endn|1}}: [[Battlefleet Gothic Rulebook]], ppg. 86*[[WD139{{Endn|White Dwarf 139]], ''Interstellar Travel'', Jervis Johnson, Andy Jones, Simon Forrest & Rick Priestley*2}}: [[WD140|White Dwarf 140Dark Heresy: Blood of Martyrs]], ''Interstellar Travel'', Jervis Johnson, Andy Jones, Simon Forrest & Rick Priestleypg. 26