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The Cassini spacecraft's flyby of Saturn's moon Iapetus has revealed a bizarre geological feature in its images: a bulging ridge at its equator. Mission scientists have started to release detailed images of the moon's surface, which is sharply divided into a bright half and a dark half. The ridge is around 13km (8 miles) high in some places - taller than Mount Everest, the tallest peak on Earth.


 Moon Cassini Saturn Iapetus equator mountain
The mountainous ridge that circles the equator on the Saturnian moon Iapetus is both weird and spectacular. Discovered in 2004, the icy rim is as much as 20km high and runs fully 1,600km from end to end. No explanation for its existence has yet won total support; it is a puzzle.


 Iapetus Moon Saturn ridge ring equator geology mountains astronomy