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The first ever high-resolution images of Saturn's moon the detailed new images—captured by NASA's Cassini orbiter in September and released yesterday—reveal that Iapetus's two-tone color scheme is seen even at the crater level. That is, one side of a crater might be dark, while the other is white. Furthermore, the dark is very dark, while the white is frosty bright. There is no grey John Spencer of the Southwest Research Institute in Boulder, Colorado, Spencer believes the stark difference is caused by uneven solar heating.
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