SUMMARY: During yesterday's press conference, scientists produced four pieces of evidence to support their claim that liquid water once acted on Mars in the region that Opportunity landed. One of these is the discovery of the presence of sulfates, which are likely formed by the action of water. There are microbes on Earth, which use sulfates as their primary source of energy, so they can be largely independent from the Sun. Perhaps something like this could be alive just under the surface of the Mars.

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