Scientists may have discovered the largest flood channels in the solar system on Mars, currently a cold desert planet. The northwestern slope valley system is ten times larger than Kasei Valles, the largest previously known outflow channel system on Mars, said James M. Dohm of the University of Arizona. The best explanation is that they were formed by catastrophic floods that at their peak potentially discharged as much as 50,000 times the flow of the Amazon River, Earth’s largest river, Dohm said. Smaller outflows flooded the valleys later in martian history. Dohm and others from the University of Arizona Department of Hydrology and Water Resources, UA Lunar and Planetary Laboratory, NASA Jet Propulsion Laboratory, U.S. Geological Survey-Flagstaff and Smithsonian Institution reported the discovery in the June 2001 issue of the Journal of Geophysical Research.