A brightly reflective Enceladus appears before the rings of Saturn, while the planet's larger moon Titan looms in the distance. Enceladus (313 miles, or 504 kilometers across) is in the center of the image. Titan (3,200 miles, or 5,150 kilometers across) glows faintly in the background beyond the rings, in this image acquired by NASA's Cassini spacecraft on March 12, 2012. (Photo by NASA/JPL-Caltech/Space Science Institute)
