Image: Pioneer 10 - Ganymede - P102a
Pioneer_10_-_Ganymede_-_P102a.jpg (228 × 227 pixels, file size: 6 KB, MIME type: image/jpeg)
Description: 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.
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