Ancient Snowfall On Mars?

There are valley networks branching across the Martian surface, which makes it reasonable to believe that water once flowed on the Red Planet. Where water might have come from would be another mystery. Whether it bubbled up from underground or fell as rain or snow is the subject of speculation and debate but a new study says it can put a new check mark in the 'precipitation' column. The authors say that water-carved valleys at four different locations on Mars appear to have been caused by runoff from orographic precipitation — snow or rain that falls when moist prevailing winds are pushed upward by mountain ridges. read more

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