A grayscale image of Iapetus, Saturn's third-largest moon, showing a striking contrast between a dark, coal-like surface and a brighter, more reflective region. The image highlights Iapetus' unusual features, including a vast expanse of dark material of unknown origin, and a prominent equatorial ridge. The mysterious moon's surface shows a mix of craters and lighter areas, hinting at a complex geological history.

Astronomy Picture from 03/01/2006

Dark Terrain on Saturn's Iapetus

Source: https://apod.nasa.gov/apod/ap060103.html


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