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The Cassini spacecraft has made a close pass of Saturn's moon Iapetus, a striking world of two halves. One side of Iapetus' surface is as bright as snow, while the other is coated in a material as dark as tar...

2005-01-04

 Moon Cassini Saturn Iapetus
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...

2005-01-10

 Moon Cassini Saturn Iapetus equator mountain
The dusty hoop lies some 13 million km (eight million miles) from the planet, about 50 times more distant than the other rings and in a different plane. ... Indeed, so feeble is the ring that scientists have calculated that if all the material were gathered up, it would fill a crater on Phoebe no more than a kilometre across.

2009-10-07

 Saturn ring astronomy Solar System Iapetus Moon Phoebe
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.

2010-12-16

 Iapetus Moon Saturn ridge ring equator geology mountains astronomy