Azimir

Azimir is a hydrogen-helium gas giant whose gravitational pull perturbs the orbit of two nearby asteroid fields, adding momentum so that asteroids shatter during collisions rather then accrete into planets.

Debris from a great battle can be seen here. Batarian naval ships, merchant ships, and a few Reaper destroyers have been pounded into wreckage. It appears that the batarian navy tried to defend the helium-3 refueling stations, giving civilian ships time to escape the system.