Previous evidence of water on Mars identified as grainflows
Wed Nov 22, 2017 6:58pm


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 granular flows, where sand and dust move rather than liquid water, according to a new article published in Nature Geoscience by the U.S. Geological Survey.

These new findings indicate that present-day Mars may not have a significant volume of liquid water. The water-restricted conditions that exist on Mars would make it difficult for Earth-like life to exist near the surface of the planet.

Scientists from the USGS, the University of Arizona, Durham University (England) and the Planetary Science Institute analyzed narrow, down-slope trending surface features on Mars that are darker than their surroundings, called Recurring Slope Lineae, or RSL.

These RSL features grow incrementally, fade when inactive and recur annually during the warmest time of year on Mars. RSL are mostly found on steep rocky slopes in dark regions of Mars, such as the southern mid-latitudes, Valles Marineris near the equator, and in Acidalia Planitia on the northern plains. The appearance and growth of these features resemble seeping liquid water, but how they form remains unclear, and this research demonstrated that the RSL flows seen by HiRISE are likely moving granular material like sand and dust.

  • 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... more
    • Previous evidence of water on Mars identified as grainflows — algorithms, Wed Nov 22 6:58pm
      • 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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