Comparison (IMAGE) Tokyo Institute of Technology Caption The Grand Canyon (a) versus a Martian dendritic river system (b) (Arabia quadrangle; 12 degrees N, 43 degrees E). Slight morphologic differences between terrestrial and Martian comparisons may be attributed to the great differences in age. Scale bar is 60 km long. Credit Google/Landsat/Copernicus (a) and Google/NASA/JPL/University of Arizona (b). Images adapted from Ramirez and Craddock (2018), <i>Nature Geoscience</i> Usage Restrictions The image may only be used with appropriate caption and credit. 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.