NASA/JPL-Caltech/Space Science Institute
Saturn’s moon Iapetus resembles a walnut, with a ridge 20 kilometres high running around its center. A new model suggests it could be made of rubble from the collapse of a former ring. And data from NASA’s Cassini spacecraft could confirm it.
Iapetus’ mountain range runs 1400 kilometres around the equator of the tiny moon. Scaled to Earth proportions, its peaks would reach over 100 kilometres high. Astronomers initially thought internal geological processes could have pushed the ridge up, but their models struggled …
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