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Mars has water on its surface, and it’s in liquid form at least some of the time.

NASA on Monday announced the results of a new study showing that salty liquid water flows seasonally on Mars, giving the red planet one of the essential ingredients for life.

The study, published online by Nature Geoscience, focuses on the mysterious recurring slope lineae, or “RSL” — narrow, streaky features on the planet’s surface spotted by NASA’s Mars Reconnaissance Orbiter spacecraft.

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!!!!!BN2015-9-28WaterOnMars!                                                                          NASA/JPL/University of Arizona

The dark streaks are known as recurring slope lineae and are believed to be evidence of flowing water. The blue color seen upslope of the dark streaks is thought not to be related to the streaks but to the presence of the mineral pyroxene.

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