Callisto is the most heavily cratered space rock we see around us.
Even Mercury and the Moon do not show as many impact craters as this dark-surfaced satellite.
Of all the moons in the solar system, Callisto ranks third in size, after Ganymede and Titan.
Its rocky composition is wrapped in an icy crust, and the surface shows dark areas where the terrain shares space with icy patches visible in white.
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