They had an episode in space last season.

I'm not sure why they'd be in outer space at that point, but they have been to outer space in the past. Can't remember exactly when, but I remember Stein being very excited about it.

That's probably the answer. Thank you. I didn't think of that. I thought if they wanted a break, they could just find a quiet clearing and turn the ship invisible or stay in the time stream. Choosing outer space was random in my opinion.

I thought the same thing.Why are they sitting in space? They aren't space explorers.
The only answer I could come up with is, cheaper production.