vontresc
En-Route
Uranus isn't just gassy, it's also tilted completely sideways, such that instead of rotating like a spinning top, it rolls around the plane of the solar system more like a giant ball. Now astronomers think they know how this happened, and it means that Uranus has been pounded really, really hard not once, but twice.

http://www.cosmostv.org/2011/10/uranus-takes-pounding-more-frequently.html?m=1
http://www.cosmostv.org/2011/10/uranus-takes-pounding-more-frequently.html?m=1