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Acid Fog Likely Dissolved Rocks on Mars

As if Mars' thin, frigid, dry air wasn't harsh enough, now scientists have found new evidence of acid fog altering the rocks near the Spirit Rover.

November 3, 2015
7:00 AM EST
You don't need to know anything about iron geochemistry to know that the stuff represented by the pie charts varies greatly across this scene, which is about 1/3 the size of a football field. Also, the 1.2m scale bar is the distance between the rover's right and left wheel tracks. | S. Cole. /NASA/JPL/Cornell/Arizona State University