NASA's Cassini spacecraft snapped this picture of a dark Enceladus, the sixth-largest of Saturn's moons and one of the most interesting to scientists because of the presence of water ice on its surface and geological activity. In the image, some of this icy geological action is visible at the moon's southern end where plumes of water-ice spray up from the terrain. Cassini took the picture at a distance of 83,000 miles on February 20, 2012.
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Rebecca J. Rosen is a senior editor at The Atlantic, where she oversees coverage of American constitutional law and government in the Battle for the Constitution series.