Anyone interested in pictures of Mars?

[guohua]

Air pressure is very low on Mars. The atmosphere is pretty thin. That means the density of the air is low, too, That means the "bulk" of the air has a really hard time moving things around - it has to make up for the lack of density by generating more speed. So how is is moving sand grains around to create dunes, much less moving the dunes after they are formed?

Are they really just dust dunes, composed of particles the air can push?

Or are they something else, something as yet undiscovered?

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True That is what we've been told by THEM, the air pressure is to Thin.
But what if it's not to thin? Could there be life or a colony there on Mars?

But if the air is thin, I think you're right about something other than the wind moving Sand and Forming Dunes.