... Unusual Gullies and Channels on Mars . ... Credit: Malin Space Science Systems , MGS , JPL , NASA Explanation: What could have formed these unusual channels? ... These and other gullies have been found on Mars in recent high-resolution pictures taken by the orbiting Mars Global Surveyor robot spacecraft. Similar channels on Earth are formed by flowing water, but on Mars the temperature is normally too cold and the atmosphere too thin to sustain liquid water . ... Victoria Crater on Mars . ...