Mars Globe (IMAGE) Washington State University Caption Visible in the center of this mosaic photo of Mars is the largest known chasm in the solar system, Valles Marineris. Credit Image processing by Jody Swann/Tammy Becker/Alfred McEwen, using the PICS (Planetary Image Cartography System) developed at the U.S. Geological Survey in Flagstaff, Ariz. Usage Restrictions Please 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.