Recurring Martian Streaks: Flowing Sand, Not Water?
Wed Nov 22, 2017 6:46pm

Recurring Martian Streaks: Flowing Sand, Not Water?
Dark features on Mars previously considered evidence for subsurface flowing of water are interpreted by new research as granular flows, where grains of sand and dust slip downhill to make dark streaks, rather than the ground being darkened by seeping water.

Continuing examination of these still-perplexing seasonal dark streaks with a powerful camera on NASA’s Mars Reconnaissance Orbiter (MRO) shows they exist only on slopes steep enough for dry grains to descend the way they do on faces of active dunes.

The findings published in Nature Geoscience argue against the presence of enough liquid water for microbial life to thrive at these sites. However, exactly how these numerous flows begin and gradually grow has not yet been explained. Authors of the report propose possibilities that include involvement of small amounts of water, indicated by detection of hydrated salts observed at some of the flow sites.

    • Busted... Previous evidence of water on Mars now identified as grainflows Dark features previously proposed as evidence for significant liquid water flowing on Mars have now been identified as... more
      • CNN Articlealgorithms, Fri Nov 24 5:54am
        About that flowing water on Mars ... This, of course, is how science works....
        • Life can not exist Jim, Wed Nov 29 3:21am
          in a Trump world.
          • Something....algorithms, Wed Nov 29 8:39pm
            ...we actually agree on. Donald Trump is a one man nonsense factory.
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