Date August 21, 2012; Retrieved October 2, 2012 < http://www.eoearth.org/article/Life_from_the_Skies >   ? Main Image 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. The largest crater on Tethys