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'''System''' is a catch-all term used by the Imperium to classify the various forms of star system that make up the [[galaxy]]. Each system is formed of at least one star and the stellar material that orbits it.
Planetary systems are a minority of the systems that make up a [[sub-sector]]. Even within planetary systems with several planets, worlds inhabitable by [[humans]] are low in number. Of the ones that are inhabitable, or worth exploiting, the majority are [[mining world|mining]], [[agri world|agri]] and [[civilised world]]s. Relatively few systems possess [[Forge World|Forge]] or [[Hive world]]s, making those that do strategically important. Uninhabited systems can also have strategic importance, depending on their galactic location.<sup>1</sup>
Traveling between systems requires use of the [[Warp]]. Many systems are linked by [[Warp|Warpspace]] channels, which significantly speed up travel time.<sup>1</sup>
