Ganymede : Geologic Map of the Uruk Sulcus Region
"This geologic map of the Uruk Sulcus region of Jupiter's moon, Gaymede, were created using images from the Voyager mission. The creators of the map looked at albedo, surface morphology and texture, and crater densities on the images to distinguish one geologic unit from another."
via astrogeology.usgs.gov
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