Omicron Major

Settled Planets
A dull, brown planet that contained Nomad specimens found by Rheinland expeditionary forces about a month before the single-player campaign in 800 A.S. It contained a huge supply of Nomad and Daam K'Vosh artifacts, but unfortunately in the process of acquiring these Rheinland personnel became possessed by the creatures, and started a trail of infection eventually leading up to Chancellor Niemann himself.

Nomad City
A large structure of unknown design that also serves as a power converter for the Nomad's and Daam K'Vosh and a projector for the Sirius hypergate. When freelancer Edison Trent destroyed it's surrounding generators, he successfully activated the hypergate with his artifact and sent the majority of the Nomad fleet, including all known capital ships in the Sirius sector, to an unknown location out of harms way, likely a neighboring sector.