One of the leading theories that explains Uranus' tilt is that it was hit early in its lifetime by a protoplanet, which disrupted its rotation axis and caused its unusual tilt. How does this hypothesis explain Uranus' moons as well? Most of them are aligned to the equator, and some are also retrograde as well. If Uranus was hit by a protoplanet, how would that have changed the orbits of its moons to match its new rotation axis as well? Could the moons have been fragments of whatever protoplanet that hit it?