Ganymede - Ancient Impact Craters in Galileo Regio

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.

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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