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Iapetus

Though the moon consists for the most part of water ice it has a bright and a dark, nearly black side. Why this is so is still unknown.

Distance to Saturn: 3 560 820 km
Mass: 1.97 * 1021 kg
Diameter: 1436 km
Orbit period: 79.32 days

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False-color image
Photo: NASA/JPL/Space Science Institute
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