Mars MFF (IMAGE) Johns Hopkins University Caption A portion of the Medusae Fossae Formation on Mars showing the effect of billions of years of erosion. The image was acquired by the High Resolution Imaging Science Experiment (HiRISE) camera onboard the Mars Reconnaissance Orbiter. 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.