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However, now NASA believes they could be 'granular flows', where grains of sand and dust slip downhill to make dark streaks, rather than the ground being darkened by seeping 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.

Dundas and co-authors examined 151 RSL features at 10 sites.

'The RSL don't flow onto shallower slopes, and the lengths of these are so closely correlated with the dynamic angle of repose, it can't be a coincidence,' said Hi RISE Principal Investigator Alfred Mc Ewen at the University of Arizona, Tucson, a co-author of the new report.