Figure 7-15 RIVUXG Beneath Titan’s Clouds (a) This mosaic of Titan was constructed from Cassini images made at visible and infrared wavelengths during a close flyby in December 2005. (b) The Huygens lander recorded this view of features on Titan carved by flowing liquid. It is too cold on Titan for water to be a liquid, so these streams and river must have carried liquid methane or ethane. (c) The nearly true-color Huygens image shows the view from Titan’s surface. The 6 in. (15 cm) wide “rock” is about 33 in. (85 cm) from the camera. Unlike Earth rocks, Titan “rocks” are chunks of water ice.