From the introduction:
Humanity has reached hundreds of worlds, and has established dozens of Colonies and Outposts. These worlds are scattered across dozens of light-years and cover a wide range of environments, and the human and non-Human inhabitants are just as diverse. Some of the most notable worlds are discussed below. The GM should feel free to add to, amend, or alter the following as desired, and to create new worlds that suit his or her game. The Star Map shows the locations of the major systems inhabited by Humanity, and indicates the Jump Distances among them. There are hundreds of worlds in and beyond the ICC not listed. Those worlds are not named, usually listed with two or three letters followed by three or four numbers. Most worlds have this listing still, but no longer go by their system classification. GMs only need to make up new systems.