Titan's Dunes (IMAGE) University of California - Davis Caption Saturn's moon Titan is crossed by dunes, as seen in this image from the Cassini space mission. The dunes are likely made of grains of crystalline water. New wind tunnel studies show the wind speeds needed to move these grains to build dunes. Credit NASA/JPL-Caltech Usage Restrictions May be used with acknowledgement of the source. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.