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A recent proposal to explain the stable presence of liquid water on
ancient Mars is the presence of clouds comprised of solid carbon dioxide
crystals that are good infra-red reflectors and so lead to suitable
temperatures at the surface.
What are the likely crystal forms of CO2? Have any calculations of halo
phenomena been made for atmospheres of such clouds (or other crystals than
those of water ice for that mattter)?
Les Cowley
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