Martian dune dynamics Options

[Arizona Dave]

It an ok video, but I must point out at saying that Mars Atmosphere is Less that 1% as "Thick" as Earth's" is both incorrect and misleading, its supposedly less than 1% as Dense...im sure this will rub a few ppl the wrong way, but in science terminology is very important. (there is debate and precedence for dust blocking tubes in all pressure sensors used to date, and the Arm that was designed to measure wind speeds broken upon impact on Curi - and dust devils based on rotation havnt presented speeds over about 50-55 mph...less than half the minimum AIMS needed to replicate them in their near-vacuum experiment -- another discussion I know)

Thick vs Dense - Not only does they way one describe something give other's important information about that something, using wrong terms can drastically change the meaning of something, leading others to design things incorrectly, and/or perpetuate incorrect information. Articulate and Precise communication is important, and especially so when presenting things for the public sphere - whether or not the average person knows thick vs dense, many do, and someone unfamiliar with previous data sets and facts could very well take the "thick" to mean distance extending up from the surface, or even some other way...in other words, regardless of who the audience is..clarity and correctness should prevail, of for no other reason than to be able to always say "We said X, and it meant X, not Y"

The fact that these dunes have large and small grains at the surface that migrate, is empirical proof that some force is moving them. We know the sizes of the grains, we know the composition of much of the minerals, and thus the density and weight of the grains, we know Mar's gravity, and using all those data sets, we can then calculate what force it takes to move grains...that amount of force then tells us what force of wind it takes to move them...which all leads back to atmospheric density, not how thick the atmosphere is.

The distance these dunes (and others) move per MOC and HiRise images contradicts known wind speeds vs *observed* Atm pressures...so something is off, or some other forces assist (static elect, CO2 out gassing, Water Vapor suspension?), and Im hoping they can really study these things to figure out why and how things are observed moving in atmospheric pressures that would suggest only the finest of particles could be moved.

Im also very intrigued by the colors seen in these latest images and all the different mineral types being seen in close-ups.

Mars keeps throwing curve balls.