Pioneer_10_-_Ganymede_-_P102a.jpg - Wikipedia

Summary

Description Pioneer 10 - Ganymede - P102a.jpg	English: Ganymede appears more like Mars than the Moon or Mercury in this close-in spin-scan image from Pioneer 10. Earlier eclipse observations from Earth suggested that Ganymede has a surface of high porosity, the upper half-inch of which might be composed of loose, fine-grained rock.
Source	http://history.nasa.gov/SP-349/ch6.htm
Author	NASA

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