Dark streaks on Mars may not be evidence of water after all [feedly]

Mars is a pretty barren place, and although vast oceans likely once covered the surface, nowadays any remaining water seems to be locked in ice at the poles or underground. But in 2011 the Mars Reconnaissance Orbiter (MRO) spotted dark streaks in the dust that appear in summer and vanish in winter, hinting at the influence of flowing water. On closer inspection however, a new NASA report suggests the answer may not be so simple.

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https://newatlas.com/mars-dark-streaks-not-water/52274/