Apparently the 2006 report that what apeared to be bright spots of places where liquid water flowed on Mars are incorrect. New findings show it to be unlikely that water flowed through these 'Martian gullies" anytime since 1999 as had been previously thought. Scientists at the University of Arizona used topographic data from the High Resolution Imaging Science Experiement camera to get incredibly detailed images of Mars and found that pure liquid water was completely ruled out. Check it out:
http://www.astronomy.com/asy/default.aspx?c=a&id=6677
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