Water on Mars any point in the year but would be ideal for solid carbon dioxide. The carbon dioxide melting in the warmer summer would yield liquid carbon dioxide which would then form the gullies. Even if gullies are carved by flowing water at the surface, the exact source of the water and the mechanisms behind its motion are not understood. The dry gullies are deep grooves etched into the slopes that are there year-round. There are many other features on Mars, and some of them change seasonally. In August 2011, NASA announced the discovery by undergraduate student Lujendra Ojha of current seasonal
Water on Mars been controlled by flow of shallow groundwater. In its years of continuous operation, "Opportunity" is still sending back evidence that this area on Mars was soaked in liquid water in the past. The MER rovers had been finding evidence for ancient wet environments that were very acidic. In fact, what "Opportunity" has mostly discovered, or found evidence for, was sulphuric acid, a harsh chemical for life. But on May 17, 2013, NASA announced that "Opportunity" found clay deposits that typically form in wet environments that are near neutral acidity. This find provides additional evidence about a wet ancient environment possibly