Changes

The '''Halo Stars''' are the stars surrounding the [[galaxy]]. The stars comprising the halo are very old and dispersed very thinly across the approximately two hundred thousand light years of the halo's diameter. Some are grouped together in clusters. The halo is almost entirely unexplored and probably contains few habitable systems. Although expeditions have been sent to the system, none have been able to return to Imperial space.

*[[Codex Imperialis]], p. 9