The axial tilt, the reason why the planet is orbiting the sun ''on its side'' is thought to be caused by a collision with a massive object (maybe a planet that no longer exists?) much earlier in its history.
I'm impressed by the everflowing fountain of knowledge that is Uranus! Its innermost ring is fascinating and its extreme winds would certainly pose a challenge to any ship that would venture into its atmosphere. Does Uranus have a surface or would such a ship just sink into its ice until it gets crushed? I guess I'll always think of the solar system as a whole from now on.
