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Mercury's north pole has frozen water according to data revealed Thursday by NASA scientists, confirming the long-held suspicion that the very hot planet closest to the Sun has ice lurking in the shade.

Crossposts: http://james-nicoll.livejournal.com/4080548.html

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Solar wind and photon bombardment causes helium to boil off into interplanetary space. Hydrogen would suffer the same fate except that it tends to form water in the atmosphere and is kept out of the upper atmosphere because it freezes out.

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