"I don't know what the percentage is, but there's quite a bit in space," said the director in an exclusive interview. "The initial trip up there, the training sessions he has to go through in order to become a Green Lantern. Then, of course at the end, he goes back up to Oa again."

That's not to say that "Green Lantern" won't spend significant time on Earth. If Hector Hammond is the film's central villain, there's bound to be a strong focus on the character's exploits on our planet. Further, Carol Ferris isn't likely to reach outer orbit — certainly not without the aid of Ryan Reynolds' Hal Jordan.

"There are a couple of bits [on Earth] in between [the space scenes]," said Campbell. "I think there will be enough [of a balance between space and Earth] to satisfy everybody."