Quote from Stuart in the episode Spoiler: Stuart Makes a Wallet
Kyle: You're not listening to me, okay? The centrifugal force of Thor's hammer is what allows him to fly. Trevor: But Thor is throwing it. That violates Newton's first law. Kyle: Uh, hey. Hey, hey. Settle an argument for us. Laws of physics don't apply to Norse gods, right? Stuart: Of course not. Thor, along with the other inhabitants of Asgard, exist outside the paradigm of the physical universe. [gasps] How do I know that?