This unidentified moon was a small moon in the galaxy.
The Planetary Pioneers attempt to penetrate the maverick moon's strong magnetic field
This small moon was originally part of a system located near the planet housing the New Academy for Space Pilots. However, for unknown reasons, the moon had been blasted out of its orbit and was on a collision course with the nearby planet. At this point, the maverick moon was traveling at well beyond lightspeed and was surrounded by a strong magnetic field.
During that time, Luke Skywalker attended the academy as a member of the Planetary Pioneers. Having no time to evacuate the planet, Skywalker and the Planetary Pioneers boarded their old X-wing starfighters in an attempt to destroy the maverick moon with Zukonium rays.
Using the power of the Force, Skywalker was the only pilot able to penetrate the moon's strong magnetic field. He then fired the Zukonium rays at the center of the moon and successfully destroyed it. Skywalker's X-wing was damaged by the explosion, which forced him to make an emergency landing. After his return to the academy, Princess Leia Organa awarded Skywalker a medal of honor for saving the planet.