Atlas is a large asteroid with no atmosphere. Temperatures are very low, and the radiation level is dangerously high for unprotected people. The Colony is a small one, composed of three domed and shielded communities with a total population of 12,000. The communities are still on a single plateau, and are connected by a monorail system.Aliens Adventure Game (1991), Leading Edge Games.
Dozens of small survey and mining craft operate out of Atlas, working in the system’s asteroid fields. These ships are specially shielded against radiation, and the crews work among the asteroids for 90 days before returning to Atlas for detoxification. The reason for all this dangerous and difficult work is the presence of complex radiation-stable hydrocarbons, which are used for medical research and genetic engineering.