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Cassini radar sees sand dunes in Belet on Saturn's giant moon Titan (lower photo) that are sculpted like Namibian sand dunes on Earth (upper photo). The bright features in the lower radar photo are not clouds but topographic features among the dunes. (Credit: NASA/JSC - uppper photo; NASA/JPL - lower photo) Mona Evans, "Titan - Planet-sized Moon of Saturn" http://www.bellaonline.com/articles/art182860.asp

Titan. Mosaic of near-infrared images from Cassini, showing lakes on Titan’s north pole. They are the dark splotches and speckles scattered around the pole. Titan’s lakes are filled with liquid methane and ethane, organic compounds which are gases on Earth but liquids on cold Titan (-180º C). (Credit: (NASA/JPL-Caltech/SSI) ) Mona Evans, "10 Amazing Facts about Saturn's Moons" http://www.bellaonline.com/articles/art28136.asp

Saturn's moon Iapetus. Discovered by Giovanni Cassini in 1671. It looks as if the moon is in shadow on the right hand side, but that is actually the dividing line between a bright hemisphere and one which is as dark as coal. (Photo: Images by Cassini probe 2004-12-31, Mosaic by Matt McIrvin) ©Mona Evans, "10 Amazing Facts about Saturn's Moons" http://www.bellaonline.com/articles/art28136.asp

Saturn's moon Iapetus. Comparison of the two hemispheres. The dark terrain is called Cassini Regio after Jean Dominique Cassini. It's fairly smooth, showing that new material is being deposited which covers old cratering. (Credit: JPL NASA) Mona Evans, "10 Amazing Facts about Saturn's Moons" http://www.bellaonline.com/articles/art28136.asp

Saturn’s moon Iapetus photographed by the Cassini spacecraft. The right side is overexposed because it’s illuminated by the Sun. The left side glows by light reflecting off Saturn’s clouds. Since sunlight is much fainter at Saturn’s distance than at Earth’s, Cassini had to make a long time exposure to capture this image. (Credit: NASA) Mona Evans, "Earthshine" http://www.bellaonline.com/articles/art301287.asp

This is a still from the video of a crescent Rhea transiting a crescent Saturn. You have to look carefully to the night side of Saturn (on the right) to see Rhea's faint crescent just below the rings. The photo is edge-on to the rings which show up as a dark line. Mona Evans, “Rhea Moon of Saturn” http://www.bellaonline.com/articles/art56119.asp

Infographic about Titan, the mysterious cloud-covered moon of Saturn. Facts about Titan's heavy atmosphere, lakes of hydrocarbons and the possibility of life. (Credit: Karl Tate) Mona Evans, "Titan - Planet-sized Moon of Saturn" http://www.bellaonline.com/articles/art182860.asp

False-color image of Europa's trailing northern hemisphere. (Credit: NASA/JPL/University of Arizona) A geological survey of Europa showed a massive, 20,000 square-km portion of its surface was gone. In Sept 2014, researchers published evidence suggesting a plate tectonic system may be moving old portions of the surface beneath adjacent plates. If confirmed, this would make Europa the only known place in the solar system (apart from Earth) whose surface is being shaped by active plate tectoni...

This illustration shows the various steps that lead to the formation of the aerosols that make up the haze on Titan, Saturn's largest moon. Mona Evans, "Titan - Planet-sized Moon of Saturn" http://www.bellaonline.com/articles/art182860.asp