The spiral galaxy in which we live. It is about 100,000 light-years in diameter and 1,000 light-years thick along the arms - thicker towards the core. There are about 4 hundred billion stars in the Milky Way, not including brown dwarfs. Sol is about 26,000 light-years from the center of the Milky Way Galaxy, and the Terragen Sphere spans a region from 20,000 to 32,000 LY from the center.
Core (Galactic) - Text by M. Alan Kazlev The densest, brightest central region of a galaxy.
Galactic Colonisation Board - Text by Steve Bowers A quasi-religious body responsible for coordinating the exploration of the Outer Volumes (under divine guidance from the Sephirotic Archailects and their representatives). Currently based on Cythera.
Sagittarius Dwarf Elliptical Galaxy (SagDEG) - Text by M. Alan Kazlev This minor galaxy has been spread out by a still on-going collision with the Milky Way. The closest parts of this remnant have been colonised by the Red Star M'Pire.
Sagittarius Dwarf Galaxy (SagDIG) - Text by M. Alan Kazlev M 31 / NGC 598. This minor irregular galaxy is located at the opposite end of the galactic core to settled space. The Sagittarius Dwarf Galaxy is approximately 10,000 light years in diameter, and roughly spheroid in shape. It is adjacent to, possibly colliding with, the base of the Outer Arm. Relativistic exploration missions have departed for this galaxy but are not expected to arrive for many tens of thousands of years.