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Ancient Terrain

This color reconstruction of part of the northern hemisphere of Ganymede was made from pictures taken at a range of 313,000 km (194,000 mi). It shows a dark, densely cratered area bound on the south by lighter, less cratered grooved terrain. Dark areas are believed to be the oldest surface on Ganymede. Numerous craters, many with central peaks, are visible. The large bright circular features have little relief and are probably the remnants of old, large craters. The closely spaced, arcuate features are similar to other features on Ganymede that surround large impact basins.

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