He doesn't ... look like he's joking, and he's earnest when he explains, but ... it's strange. He thought he knew a lot about space travel. How could he not, after all those SG team mission reports he's read? But just walking through a door, past ... fur coats? (That's not a phrase he's familiar with, but he can kind of work out what it might mean.)

Actually, of the two things that Peter's just said, the everlasting Winter is the easier for him to believe.

But there's absolutely no sign that the earnest young man is joking. Not even that thing that Teal'c and O'Neill do where they say something like it's completely serious and then keep looking serious, waiting for Jonas to catch on.

"I have to say, of all the ways of travelling between worlds I know, that one's ... uh ... pretty unusual."