This ghostly image shows the sunlit edge of Titan, Saturn's largest moon. Captured by Cassini, it's unilluminated atmosphere provides a hazy yet breathtaking view.
Visible in the darkness is the south polar vortex of the moon, because its clouds are at a higher altitude than the rest of the atmosphere. Snapped from 808,000 miles away, the image makes use of a spectral filter sensitive to wavelengths of near-infrared light centered at 938 nanometers to capture the beauty of Titan. It worked. [NASA]