Moffat, in my experience, has a real talent for taking complete nonsense like that and embedding it into a story in just the right was as to make one's suspension of disbelief happily go along with it. I'm not at all sure how he does it, though. I want to say something like, "He writes it as if he believes it," but I'm not entirely sure whether that statement means anything or not. Maybe it's just that he knows how to write a good, atmospheric, and apparently self-consistent story around his nonsensical premises. Or maybe it's just that the nonsense he writes about is nifty enough that you want to accept it and strange enough that your brain doesn't immediately go, "Yeah, come on, I know better than that."

Whatever it is, I sure hope he keeps it up. :)