September 17, 2012
A Specific Sort of White Christmas

Steve U gets a no-prize so cold even Santa won't touch it for bringing us news that NASA scientists are reporting the first firm sightings of CO2 snow on Mars. Unlike the more conventional stuff found at higher latitudes on Earth, this is the actual atmosphere of the planet freezing and precipitating out. The mechanisms help explain what makes Mars' north pole tick, but exactly how the more permanent formations at the south pole work remain a mystery.

Posted by scott at September 17, 2012 11:49 AM

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