There are between two and four hundred billion stars in the galaxy, and less than 1% of them have every been visited or had their systems properly surveyed.
Humanity's early expansion into the Attican Traverse was haphazard; a desperate race to claim habitable planets where populations can be economically settled. Ignored in the wake of the land grab were thousands of less hospitable worlds, each potentially rich was industrial resources. The wealth of entire solar systems lies untapped, waiting for corporate survey teams or independent pioneers to discover and exploit them.
This, however, is not an easy task. In addition to the environmental hazards, the fact that uncharted worlds are largely ignored makes them popular bases for criminals, revolutionaries, cults, and others who wish to remain unnoticed by galactic society.