Free Astronomy Magazine November-December 2017

NOVEMBER-DECEMBER 2017 SATURN Dark material splatters the walls and floors of craters in the surreal, frozen wastelands of Iapetus. This image shows terrain in the transition region between the moon's dark leading hemisphere and its bright trailing hemisphere. [NASA/JPL/Space Science Institute] IAPETUS The brightest hemisphere of Iapetus. The prominent basin on the southern trailing side is Engelier. [NASA/JPL/Space Science Institute] The equatorial ridge that runs along the center of Cassini Regio, about 1,300 km long, 20 km wide, and 13 km high. This prominent bulge gives Iapetus a walnut-like appearance. [NASA/JPL/Space Science Institute]