This has really been bothering me..
The first time I was in the queue for Mission:Space, I saw the giant rotating circle, and was certain it was part of the set from Horizons with the floating boy and his dog. When I mentioned this to a cast member, they said it wasn't that, and that it was instead a set piece from Mission to Mars. I believe them, but at the same time, it seemed like an awfully big coincidence. Does anyone know if this is definitely true?