The Cularin system is surrounded by a dense comet cloud, remnants from the system's formation. Most of the comets follow erratic courses around the system, some of which have dense cores similar to the system's heavier planets.
They interact with each other resulting in occasional collisions, showering frozen debris resulting in the creation of smaller comets.
The comet cloud is sometimes known to cause interruptions in hyperspace travel. This is an annoyance to some of the system's inhabitants, though also contributed to the system's defenses.