A black hole orbiting a blue supergiant (HDE 226868) with a period of 5.6 days. This system is just outside the current boundary of the Terragen Sphere, and is believed to be a congregation point for several xenosophont races, including the Muuh, the Meistersingers and the Wayfarers.
Cygnus Volume - Text by M. Alan Kazlev Volume of space encompassing the constellation Cygnus as seen from SolSys; formerly incorporated into House Cygexpa.
Event Horizon - Text by M. Alan Kazlev The Schwarzschild radius; the radius from a black hole or other physical singularity within which even light cannot escape. It is also the radius to which a mass must be compressed down to in order to turn it into a black hole.