The frame-filling view of Saturn's moon Rhea was taken by Cassini on August 1, 2005. Although in this image, Rhea looks quite similar to our Moon or the planet Mercury, it's actually covered in thick ice which would melt if it ever got as close to the Sun as Mercury. Rhea is 1,528 kilometers (949 miles) across, and you can see one of its larger craters, Izanagi, near the middle of the moon.