Oa (comics)
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Oa is a fictional planet that lies at the center of the DC Comics universe. Since its inception, Oa has been the planetary citadel of the Guardians of the Universe and headquarters of the Green Lantern Corps. It first appeared in Green Lantern #1, when the Guardians summoned Hal Jordan's "energy duplicate" so they could hear of his origin.
Oa, with the Guardians of the Universe and the Green Lantern Corps. Art by Alex Ross.
Oa as it appears in Green Lantern
Sinestro Corps
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The Sinestro Corps, occasionally known as the Yellow Lantern Corps, is a supervillainous group and analog to the Green Lantern Corps in the DC Universe. They are led by Sinestro, and derive power from the emotional electromagnetic spectrum of fear.
The Sinestro Corps gathers on Qward.
Prominent members of the Corps, including (clockwise from top left): the Cyborg Superman (Hank Henshaw), Superman-Prime, the Anti-Monitor, Parallax (Kyle Rayner), and Sinestro. Art by Ethan Van Sciver.
A Yellow Power Ring