Ancient impact craters shown in this image of Jupiter moon Ganymede taken by NASA Galileo spacecraft testify to the great age of the terrain, dating back several billion years.
http://photojournal.jpl.nasa.gov/catalog/PIA00279
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Details
Title: Ganymede - Ancient Impact Craters in Galileo Regio
Creator: NASA/JPL
Date Created: 1997-09-07
Rights: JPL
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