This planet revolved around the sun? Really? News to him, but again, he's heard so many strange things here by now that while it comes as a surprise, it's not more of a surprise than magic or returning from the dead.

The rest is interesting too, in its own mysterious way that stories of people's worlds often are here. Interesting, and well beyond his understanding of how worlds are supposed to work. "A flat world? I can't even imagine what that's like," he says, puzzled. "How does the water keep from falling off?"

Because of course that's the first thing he thinks of.