Two tone fans
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by Dr_Kong
Earlier, lighter coloured material outlining the darker central fan - perhaps it was laid down earlier? Two different types of material being shown or one which darkens with age/exposure?
Posted
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by Portyankina scientist
Have a look here: http://blog.planetfour.org/ for details, but in short: These blue fans are fresh CO2 crystals that are either 1) got exposed while dark dust sinks through CO2 ice layer or 2) recently condensed on top of dust. We still do not know which one is the right answer.
Anya
Posted