Mars may have flowing salt water: NASA (AFP)

This NASA image obtained in March 2011 and taken from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter shows portions of the Martian surface. Scientists have spotted dark stripes on some slopes on Mars in the warmer months, and they believe it may be evidence of flowing salt water, NASA researchers said on Thursday.(AFP/NASA/File)AFP - Scientists have spotted dark stripes on some slopes on Mars in the warmer months, and they believe it may be evidence of flowing salt water, NASA researchers said on Thursday.