Mars Globe (image) Washington State University Share Print E-Mail 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. Share Print E-Mail 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.