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Studies of RSL, and in particular the findings by the MRO, introduced the tantalizing possibility that there could be enough liquid water on the surface of Mars today to support microbial life. [Photos: The Search for Water on Mars] But the new study shows that those dark RSL could simply be flows of sand and other granular material, according to a statement from NASA. In addition, the authors provide more reasons why the liquid water explanation does not fit with certain features of RSL. "We've thought of RSL as possible liquid water flows, but the slopes are more like what we expect for dry sand," Colin Dundas, a research geologist with the US Geological Survey's Astrogeology Science Center and a lead author on the new study, said in the statement. "This new understanding of RSL supports other evidence that shows that Mars today is very dry." However, neither study can fully explain all the features of the Martian RSL, and the authors of the new paper admit the mystery may not be solved until a rover or a human expedition can explore those regions directly.