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July 1999--Spring is rapidly approaching for the martian southern hemisphere. Over the past month, much of the high southern latitudes of Mars have emerged from nearly 5 months of wintertime darkness, revealing a bright, frost-covered surface that presently extends from about 57S to the south pole. Frosts at this time of year can consist of both frozen carbon dioxide (" dry ice" ) and frozen water. The above images are interpreted to show surfaces covered by water frost, because the temperature of the surface at the time the images were acquired was about -184F or -120C (visit the
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