Gershoul-P-4 was among the first planets colonized by the Andalite people. As such, it has developed into a major planet. It has Aratone mines, power crystal caves, and large expanses of grassland. The Andalites set up important research labs on its moons. On one of the moons, Gershoul M-2-P-4, had a weapons development facility working on a number of projects, including quantum energy based weaponry. There was an unexpected surge, and the zero point energy broke containment, and unleashed enough power to shatter the moon. It killed over a thousand Andalites.
This had a number of enviromental repracusions for Gershoul-P-4.