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Recurring Martian Streaks: Flowing Sand, Not Water?
This inner slope of a Martian crater has several of the seasonal dark streaks called "recurrent slope lineae," or RSL, that a November 2017 report interprets as granular flows, rather than darkening due to flowing water. The image is from the HiRISE camer
Credit: NASA/JPL-Caltech/UA/USGS
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.
From Jet Propulsion Laboratory/NASA
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