For whatever reason, Elliot's solar-system set contains no Pluto, which was downgraded to a minor planet in 2006.
Actually, at the moment his solar system contains no Jupiter, Saturn or Neptune either. They fell to the floor a few days after we put them up there.
I tell Elliot, "Don't worry, Uranus is still stuck to the ceiling," and then giggle for a long time. Fortunately, he has no idea what I'm talking about.