The Mortals universe, as well as being a playing ground for Yags, is also a test bed for some universe creation tools. Role players familiar with the old Traveller setting will find some things familiar in the way that worlds portrayed, and this is no accident - the software suite used was originally developed to flesh out Traveller world data.
The aim for describing the Mortals setting is to provide thousands (maybe more) of star systems, with fully described and mapped worlds, all generated randomly. This is not a trivial exercise, and is still a work in progress.
The Mortals campaign map is fully two dimensional - entirely for the practical reason of making mapping and visualisation much easier. Information is currently focused on the 9 sectors comprising of Sol Sector and its immediate neighbours.
For a quick view of what this may all look like, see http://dev.glendale.org.uk/mortals/index.jsp.