Known Space

Known space is a relatively small area of galaxy. It consists of all the space which is known to humanity either through exploration or through communication with other races. In size it is a sphere approximately 60 light years in diameter but humans have occasionally passed outside its boundary.

Human Worlds
Humanity of course started out on Earth and began to spread out into their solar system and nearby systems after the development of the Bussard Ramjet. Its development allowed the creation of ramscoop robots which could remotely search the stars for habitable worlds. This lead to the discovery of the planets in the Alpha Centauri, Tau Ceti and Procyon system in the mid-21st century. Slow-boat colony ships left soon after to Plateau and the planet that would become We Made It