Titan and Saturn (IMAGE) University of Texas at Austin Caption Titan is Saturn's largest moon. Its cloudy appearance comes from an atmosphere mixed with gaseous nitrogen and hydrocarbons. Credit NASA Jet Propulsion Laboratory/ Cassini Orbiter. Usage Restrictions Credit 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.