Enceladus (IMAGE) University of Colorado at Boulder Caption A team led by CU-Boulder has shown that Saturn's icy moon Enceladus is spewing tiny silica grains, an indication hydrothermal activity is occurring in its ice-covered ocean. Such extreme environments are known to be suitable for life on Earth. Credit NASA/JPL Usage Restrictions None 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.