The Sun is 93 million miles away from the Earth. It isn't the heat that would kill one, but the atmosphere. No oxygen, no gravity. This is like a very advanced plane. [He thinks a moment, then adds] A large metal object that flies in the sky rather like this.

[Rowan looks at the books and ponders searching for something that shows pictures of a plane. He is sure there is something there, but finding it within the frame of this conversation would be impossible.

Then he remembers the computer in the corner, where he spent a fruitless hour arguing with to define where they were and where they were going.

It failed at that, but he figures it can show her what an airplane is] I can show you.