Mouse is an airless rock that follows an elliptical orbit around Planet Shimaya. A trio of domed observatories have been constructed on these moons, staggered so that one is always in darkness at any given point. They are used to observe the cosmos for Astrogation and Astronomy researchers. Students from Khalud Academy often make field trips to these observatories for their ongoing studies.
The lack of useful mineable material has left this moon otherwise untouched.