A regular Jekyll and Hyde, which planet has a moon that's two-toned?

One of Saturn's many moons, Iapetus, is a two-toned gem. One side has an extremely dark hemisphere, while the other is light. You can find this contrast nowhere else in the solar system, and scientists theorize that another darker moon (Phoebe) may be shedding some particles onto its surface. Others think it could be thermal segregation.

Last updated 5 years ago · 5.5K views · SOURCE