This Voyager 2 photo of Neptune's largest satellite, Triton, was part of a set received between 3:30 a.m. and 5:30 a.m., Aug. 25, 1989. It shows a surface dominated by many roughly circular, polygonal, and arcuate features between 30 and 50 km (18 and 30 miles) across. Some resemble degraded impact craters of Mars, while others resemble the "palimpsest" features of Jupiter's satellite, Ganymede. Peculiar intersecting, doubled ridge lines are 15 to 20 km (9 to 12 miles) wide and hundreds of kilometers long. They resemble some deformational belts of Ganymede. Patches of plains-forming material tend to occur in local depressions. The geologic features of Triton and spectroscopic information indicate that the surface of Triton is underlain by a mixture of ices. The Voyager Mission is conducted by JPL for NASA's Office of Space Science and Applications.
