Musings on anything and everything from a middle-aged comic book geek, father, husband, and sufferer of chronic illness. What does the title mean? In DC Comics, Oa is the planet at the center of the Universe where the Guardians pursue justice and order through their intergalactic police force, the Green Lanterns. To be a Green Lantern you must be capable of overcoming fear. You don't have to be from Krypton or be an orphaned billionaire, you just have to be The Right Person.