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
Mars to Mars by the Soviet Union, the United States, Europe, and India to study the planet's surface, climate, and geology. , Mars is host to eight functioning spacecraft: six in orbit—"2001 Mars Odyssey", "Mars Express", "Mars Reconnaissance Orbiter", "MAVEN", "Mars Orbiter Mission" and "ExoMars Trace Gas Orbiter"—and two on the surface—Mars Science Laboratory "Curiosity" (rover) and "InSight" (lander). Another rover, "Opportunity", is inactive now, but NASA still hopes to reestablish contact with it. The public can request images of Mars via the "Mars Reconnaissance Orbiter" HiWish program. The Mars Science Laboratory, named "Curiosity", launched on November 26, 2011, and reached