Two thousand years before the time of Spacemouse 9, a previously unknown horde of alien invaders emerged from the asteroids and ravaged the moon. Thousands of Rothi were killed. To protect against future invasions, the Rothi initiated space patrols of the asteroid ring. For the purpose of organizing the patrols the ring was divided into ten sectors. The distant half of the ring is beyond the range of the average Rothi spacecraft and is therefore largely unexplored. The most heavily patrolled sector is Sector 1 in which is located the Rothi moon. The further a sector is located from Rothi-En, the fewer patrols it is assigned. Sectors 8 and 9 are the most distant. Spacemouse 9 is the sole member of the Spacemouse Corps assigned to patrol Sector 9.
For information on the numerical symbols shown on the map, see Numeral System of the Rothi.
