From NASA's Planetary Photojournal
This is a natural color view of Ganymede from the Galileo spacecraft during its first encounter with the satellite on June 26, 1996.. North is to the top of the picture and the sun illuminates the surface from the right. The dark areas are the older, more heavily cratered regions and the light areas are younger, tectonically deformed regions. The brownish-gray color is due to mixtures of rocky materials and ice. Bright spots are geologically recent impact craters and their ejecta. The finest details are about 13.4 kilometers across.
Image Title: Ganymede Color Global
Catalog #: PIA00716
Target Name: Ganymede
Spacecraft: Galileo Orbiter
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Last Modified On: Monday, December 18, 2000