Bright Moon is one of the two moons of the planet Eternia. The moon is always in the light side of the planet, and enjoys unfettered access to sunlight. Accordingly the lunar colony on Bright Moon is prosperous, with advanced technology and agriculture. The Bright Moon had a treaty with Eternia's other moon, the Dark Moon Phantos, to establish a solar mirror to reflect sunlight onto the Phantos in return for shipments of Photanium. However, in the episode The Shadow of Skeletor, the two moons almost went to war after Queen Elmora abdicated the Phantos throne in favor of her brother King Barbo.