An MIT-led team on scientists has found that water is the predominant frozen liquid on the Southern Pole of Mars. Maria Zuber, an MIT professor of geophysics, said that scientists have long suspected that this pole was predominately frozen carbon dioxide, and not water, because Mars' atmosphere is 95% carbon dioxide with only traces of water. These scientists also found that this pole on Mars contains the largest deposit of frozen water in the inner solar system, outside of Earth. This discovery was made by calculating the density of the composition of the Southern polar cap.
http://www.marstoday.com/news/viewpr.html?pid=23617
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