Saturn outermost large moon, Iapetus, has a bright, heavily cratered icy terrain and a dark terrain, as shown in this NASA Voyager 2 image taken on Aug. 22, 1981.
http://photojournal.jpl.nasa.gov/catalog/PIA00348
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Details
Title: Iapetus Bright and Dark Terrains
Creator: NASA/JPL/USGS
Date Created: 1998-06-04
Rights: JPL
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