Meridiani Planum Was Wet Astrobiology Magazine

Opportunity scientists now believe that the landing site near the martian equator was once ‘an area where liquid water once drenched the rocks’. In places, up to forty percent of the outcrop can be composed of sulfate-rich salts, akin to magnesium sulfate like epsom salts. The presence of bromine also suggests that the region may have formed by slow evaporation and percolation by water.