GU Muscae contains black hole GRS 1124-683, studied by early Earth astronomers for the bright flashes of X-ray and gamma-ray emissions it produced. The K-class companion star loses gas to the black hole, forming an accretion disk which periodically creates bright outbursts of X-rays, along with visible light and other forms of energy. As of 3303, a terrestrial world with active ammonia-based life was discovered just 100 light-seconds from the black-hole.

GU Muscae is located in an area of space with a low star density. Long jump range, neutron star boosting of frame-shift drives, and other techniques are required to visit the system. The nearest system (Flyoo Hypoi QN-S D4-0) contains every material for jump-drive injection except Polonium.