NASA Finds 'Dry Ice' Snowfalls on Mars  NASA Finds 'Dry Ice'
Snowfalls on Mars  Tags: carbon, dioxide, agency, evidence,
scientists, discovered, snowfalls, provided, reconnaissance,
orbiter  Scientists at the U.S. space agency NASA say they have
discovered evidence of carbon dioxide snowfalls on Mars.  The
space agency data provided by its Mars Reconnaissance Orbiter
provides evidence that the Red Planet has snow clouds made of
frozen carbon dioxide, better known as "dry ice."  NASA says
data from observations in Mars' south polar region during its
2006-2007 winter points to what would be the only known example
of carbon dioxide snow falling in the solar system.  NASA study
author Paul Hayne said in a statement Tuesday that the finding
of snowfall could explain why Mars' south polar residual ice cap
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