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Bruce Murray Space Image Library

Near-global high-resolution color view of Ganymede from Voyager 2

Near-global high-resolution color view of Ganymede from Voyager 2
Near-global high-resolution color view of Ganymede from Voyager 2 This high-resolution color mosaic of the anti-Jovian hemisphere of Ganymede was created using orange, blue and violet images (in the RGB channels respectively) from Voyager 2 at a resolution of 2 kilometers per pixel. NASA / JPL / Constantine Thomas

The large light-toned ridge systems crossing from the northwest to the southeast of the image are Uruk Sulcus (the northernmost of the two) and Tiamar Sulcus. The bright impact crater near the bottom of the image is Osiris. Near the left of the image just above center, many bright circular features are visible in the darker-toned terrain, with the two largest being Memphis Facula (340 km wide) and Siwah Facula. These faculae are features called "palimpsest," or "ghost craters," unique to the icy satellites of the outer solar system, and are thought to be the remnants of highly eroded ancient craters.