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Astronomy Slideshow

Tethys - Saturn's Moons Slideshow

Saturn's Moon Iapetus This image shows Saturn's moon Iapetus in near-true color. Seeing Iapetus in color is helpful because you can see the difference between shadows (in black) and dark areas of the surface (in browns).

You are looking at the northern part of the dark Cassini Regio and the transition zone to brighter surfaces as you move to the northern part of the moon. The surface of the transition zone seems to be stained by north-south streaks of dark material. On planets with an atmosphere, these streaks could have been created by precipitation. Since Iapetus has no atmosphere, astronomers believe they may be materials that were displaced during an earlier impact on the moon.

Image Credit: NASA/JPL/Space Science Institute

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