Triton's Dark and Light Patches

Explanation: NASA's Voyager 2 acquired this black and white image of Triton, Neptune's largest satellite, during the night of Aug. 24-25, 1989. Triton's limb cuts obliquely across the middle of the image. Three irregular dark areas, surrounded by brighter material, dominate the image. Low-lying material with intermediate albedo occupies the central area, and fresh craters occur along the right margin. The field of view is about 1,000 km (600 miles) across.

Pluto

Image credit: NASA/JPL.