Bright young impact craters speckle the two-toned surface of Jupiter's moon Ganymede, the largest moon in the solar system, in this mosaic of images from the Galileo spacecraft. The dark brown regions probably represent Ganymede's original crust, while the lighter regions are younger terrain. The impact craters splashed out ice, which makes up most of the moon's crust, from below the surface. [NASA/JPL]
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