The limb of Triton (natural colors - elab. NASA)

Caption NASA originale:"This natural color image of the limb of Triton was taken early in the morning of Aug. 25, 1989, when the Voyager 2 spacecraft was at a distance of about 210.000 Km (128.000 miles) from the icy satellite. The largest surface features visible area about 3 miles across. The picture is a composite of images taken through the violet, green and clear filters.
The image shows a geologic boundary between a rough, pitted surface to the right and a smoother surface to the left".