The "Cassini Regio" of Japetus (1) - possible natural colors; elab. Lunexit

Caption NASA:"Iapetus, Saturn's third largest moon, is a candidate for the strangest moon of Saturn. Tidally locked in its orbit around the Ringed Gas Giant, Iapetus is sometimes called the "Yin-Yang Moon" because its Leading Hemisphere is very dark, reflecting about 5% of the Sun's light, while its Trailing Hemisphere is almost as bright as snow. This recent Cassini spacecraft flyby image is one of the closest views ever and spans about 35 Km across a cratered transition zone between bright and dark terrain. Iapetus itself has a density close to that of water ice, but the detailed reflective properties of the dark material suggest an organic composition.
Honoring the moon's discoverer, the dark terrain is called Cassini Regio".