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    The surface of Mars: Images from space - | of | Share this photo

    This undated photo provided by NASA and taken by an instrument aboard the agency's Mars Reconnaissance Orbiter shows dark, narrow, 100-meter-long streaks on the surface of Mars that scientists believe were caused by flowing streams of salty water. NASA/JPL/University of Arizona via AP

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    The surface of Mars: Images from space - Reuters | of | Share this photo

    NASA's Mars Science Laboratory rover Curiosity appears as a bluish dot near the lower right corner of this enhanced-color view from the High Resolution Imaging Science Experiment camera on NASA's Mars Reconnaissance Orbiter taken on June 27, 2013. The rover's tracks are visible extending from the landing site, "Bradbury Landing," in the left half of the scene. Two bright, relatively blue spots surrounded by darker patches are where the Mars Science Laboratory spacecraft's landing jets cleared away reddish surface dust at the landing site.

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    The surface of Mars: Images from space - NASA/JPL/University of Arizona/via Reuters | of | Share this photo

    Dark narrow streaks called recurring slope lineae emanate out of the walls of Garni crater on Mars. Scientists have found the first evidence that briny water may flow on the surface of Mars during the planet's summer months, a paper published on Monday showed.

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    The surface of Mars: Images from space - Reuters | of | Share this photo

    A view of the Noctis Labyrinthus region of Mars, perched high on the Tharsis rise in the upper reaches of the Valles Marineris canyon system is seen in this 2013 NASA handout picture by the High Resolution Imaging Science Experiment instrument aboard NASA's Mars Reconnaissance Orbiter.

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    The surface of Mars: Images from space - Reuters | of | Share this photo

    Nili Patera, one of the most active dune fields on the planet Mars is shown in this handout photo taken by NASA's Mars Reconnaissance Orbiter on March 1, 2014. By monitoring the sand dune changes, NASA can determine how winds vary seasonally and year-to-year.

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    The surface of Mars: Images from space - Reuters | of | Share this photo

    NASA's Hubble Space Telescope snapped this portrait of Mars within minutes of the planet's closest approach to Earth in nearly 60,000 years in this picture taken by NASA on August 27, 2003. In this picture, the red planet was 34,647,420 miles from Earth.

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    The surface of Mars: Images from space - | of | Share this photo

    A handout image made available by NASA shows dark, narrow, 100 meter-long streaks called recurring slope lineae flowing downhill on Mars that are inferred to have been formed by contemporary flowing water. Getty Images

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    The surface of Mars: Images from space - Reuters | of | Share this photo

    An image from the Mast Camera on NASA's Mars rover Curiosity shows the surface of the planet with inclined layering known as cross-bedding in an outcrop called "Shaler" on a scale of a few tenths of a meter in this NASA handout released January 15, 2013.

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    The surface of Mars: Images from space - Reuters | of | Share this photo

    Mars' northern-most sand dunes are seen as they begin to emerge from their winter cover of seasonal carbon dioxide (dry) ice in this image acquired by the HiRISE camera aboard NASA's Mars Reconnaissance Orbiter on Jan. 16, 2014. The steep lee sides of the dunes are also ice-free along the crest, allowing sand to slide down the dune. Dark splotches are places where ice cracked earlier in spring, releasing sand, according to a NASA news release.

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    The surface of Mars: Images from space - NASA/JPL-Caltech/Univ. of Arizona/via Reuters | of | Share this photo

    Portions of the Martian surface show many channels from 1 meter to 10 meters wide on a scarp in the Hellas impact basin, in this photograph taken January 14, 2011.

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    The surface of Mars: Images from space - Reuters | of | Share this photo

    The base of Mars' Mount Sharp - the rover's eventual science destination - is pictured in this August 27, 2012 NASA handout photo taken by the Curiosity rover.

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