Compared to SF Nergal crater Ganymede, larger than the planet Mercury, is the largest Jovian satellite and the largest moon in the solar system. Its distinctive surface is characterized by patches of dark and light terrain.
Bright frost is visible at the north and south poles.
The very bright icy impact crater, Tros, is near the center of the image in a region known as Phrygia Sulcus. Ganymede's surface is characterized by a high degree of crustal deformation. Much of the surface is covered by water ice, with a higher amount of rocky material in the darker areas. It is larger than Mercury and Pluto, and three-quarters the size of Mars. If Ganymede orbited the Sun instead of orbiting Jupiter, it would easily be classified as a planet.