Oa is a fictional planet in the DC Comics universe, primarily known as the home of the Green Lantern Corps. It serves as the central hub for the Corps, where Green Lanterns from various sectors of the universe gather to receive their missions and training. Oa is depicted as a technologically advanced world with a unique landscape, including the Central Power Battery, which powers the Green Lantern rings. The planet is also significant for its role in the emotional spectrum, representing willpower. Oa is governed by the Guardians of the Universe, ancient beings who oversee the Green Lanterns and maintain order across the cosmos. The planet's rich lore contributes to the broader narrative of the Green Lantern series.