Fact Sheet
Walnut Moon
Iapetus, a moon of Saturn, looks like a walnut in this image from the Cassini spacecraft. A tall, sharp mountain ridge traces the moon's equator, providing the walnut appearance. One side of ice is as white as snow (at the top of the picture), while the other is almost as dark as charcoal. Cassini will fly close to Iapetus on September 10. [NASA/JPL/SSI]
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