Nili Patera Volcanic Caldera (IMAGE) Georgia Institute of Technology Caption The Nili Patera volcanic caldera contains some of the fastest-moving sand dunes on Mars. New spectral data and modeling reveal that they are racing across unusual Martian bedrock. Credit NASA/JPL/University of Arizona 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.