this Imperial prison planet was located in the Seltaine System of Irishi Sector. The surface of the planet was utterly devoid of life, without plants or animals, and had barren, frigid landscape. The prison was contained in several domes which kept good air in and bad air out. This arrangement was often preferred by the Empire, because it made escape from the prison nearly impossible to survive. The average day on Selnesh lasts 37 standard hours, and its year lasts 489 local days.