... 27.01.2010 . ... Credit Copyright: Cassini Imaging Team , ISS , JPL , ESA , NASA Explanation: What's that behind Titan? It's another of Saturn's moons: Tethys . The robotic Cassini spacecraft orbiting Saturn captured the heavily cratered Tethys slipping behind Saturn's atmosphere-shrouded Titan late last year. ... In 2004, Cassini released the Hyugens probe which landed on Titan and provided humanity's first views of the surface of the Solar System's only known lake-bearing moon . ...