Traveller Core Rulebook, Moongoose Publishing, 2008.
Traveller is a science fiction roleplaying game of the far future. Humanity has gone to the stars and found them crowded with other forms of life and other sentient races, and science and technology have advanced vastly over the present day – but the essential nature of humanity is unchanged. Life continues as it does today, only spread out over the sea of stars. A mighty Imperium unites thousands of star systems under a single rule, but it is beset by enemies both internal and external.
The Imperium commands the space between the stars, ensuring that civilisation endures and trade continues. Megacorporations and feudal lords conduct the bulk of this trade, but there will always be a place for the free trader – hardy travellers and adventurers on the fringes of known space, dealing in strange goods and smuggled cargoes, doing whatever they can to make a credit.
While the Traveller rules can be used to model almost any science fiction novel, movie or setting, the traditional setting for games is the Third Imperium of Mankind, the third great empire to stretch across the stars. In the Third Imperium setting, the players take on the roles of tramp merchants and mercenaries, wandering the galaxy in search of profit and adventure.