US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY
Ganymede, geologic map. Map of Ganymede, the largest moon of Jupiter, based on data from the Voyager spacecraft. The map is coloured according to albedo (brightness), topography and morphology. Ganymede's surface is composed of water-ice and rock mixed with ice. The surface features dark regions covered with impact craters and lighter regions criss-crossed by grooves and ridges. It is thought a saltwater liquid ocean exists beneath the crustal surface.
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