Water Vapor Density Distribution (IMAGE) Moscow Institute of Physics and Technology Caption Water vapor density distribution over the surface of Mars during Martian summer in the Northern Hemisphere. Arrows indicate wind direction. Credit Credit: Dmitry Shaposhnikov et al./<em>Journal of Geophysical Research: Planets</em> 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.