Well, let's go through them one by one starting with the one closest to the sun: "What is going on..." on Mercury? Not much really! Gravity would be down to about a third. read more
This gives it seasonal changes completely unlike those of the other major planets. Other planets can be visualized to rotate like tilted spinning tops on the plane of the Solar System, but Uranus rotates more like a tilted rolling ball. Near the time of Uranian solstices, one pole faces the Sun continuously and the other one faces away. read more