For 13 years the Cassini spacecraft has been orbiting Saturn and its moons, sending back thousands of spectacular pictures. Now nearing the end of its mission, it will be exploring the ring system and ultimately entering Saturn’s atmosphere on September 15th, 2017. Once in a while when the geometry is suitable, Cassini pauses to take a picture of the Earth while moving between science targets. These homeward looks from 900 million miles away evoke a haunting loneliness.