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Water Everywhere on Mars, But Is Any of It Ever Liquid?

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Science  10 Apr 2009:
Vol. 324, Issue 5924, pp. 161
DOI: 10.1126/science.324.5924.161b

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Summary

At the Lunar and Planetary Science Conference, teammates on the Phoenix mission to Mars reported Phoenix observations buttressed with thermodynamic arguments that suggest that briny liquid water exists at the Phoenix site. Not everyone agrees.