Evidence gathered by NASA's rover, Opportunity, may give insights to an earlier climate on Mars.
Opportunity has discovered salty minerals on the plains it has traversed. One theory has been that an ocean was stood on that spot, but there are no geologic formations that would form a basin that could contain liquid water. A new theory suggests that the salty minerals are in fact evidence of ancient ice fields.
Science has determined that Mars' poles have wandered over the surface over time. Opportunity is operating in what is now an equatorial region, but at some point in the past, according to this theory, it was a polar area and the climate was cold enough to support extensive ice fields.
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