Study: Mars Water Didn’t Last Long

If water ever flowed over Mars’ surface, it was a one-night stand, say geochemists studying the properties of an unusual mineral allegedly found by the Opportunity rover at Meridiani Planum.
The possible detection of a normally short-lived mineral called jarosite seems to indicate that there was liquid water on at least Meridiani Planum. But the moisture didn’t last long and hasn’t been back since.