Well, this a little awkward. Riku looks down at his left forearm, where Roxas had broken it once. He had to have it reset when he had gotten home.

"I guess so," he said. "I've never thought about it. I think Magic plays a part."

He scratched his chin. "Um... actually, the space ship we have is owned by an alien. Most humans don't have access to space ships. Some do though." Like the residents of Radiant Garden, and even then only Cid is capable of piloting them. But there are other ways of traveling between the worlds.