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The carbon dioxide SNOW on Mars

Dailymail: NASA has 'clear evidence' of carbon dioxide snowfalls on Mars, the space agency revealed today - making this the only known example of carbon dioxide snow falling anywhere in our solar system.
Frozen carbon dioxide, better known as 'dry ice', requires temperatures of about -125C (-193F) which is much colder than needed for freezing water.

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dailymail.co.uk
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