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Dune Sea in Mars Crater

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[caption id="attachment_28815" align="aligncenter" width="500" caption="Photo: NASA/JPL-Caltech/University of Arizona"][/caption]

The Mars Reconnaissance Orbiter's HiRISE camera recently revealed fascinating shots of a dune sea of sorts in a crater of the Hellas impact basin.  What has officials at NASA excited about the dunes is their symmetric nature.
The dunes here are linear, thought to be due to shifting wind directions. In places, each dune is remarkably similar to adjacent dunes, including a reddish (or dust-colored) band on northeast-facing slopes. Large angular boulders litter the floor between dunes.

The most extensive linear dune fields known in the solar system are on Saturn's large moon Titan. Titan has a very different environment and composition, so at meter-scale resolution they probably are very different from Martian dunes.

Link.  See more stunning images (like frosted dunes) at the HiRISE site.

Comments (4)

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Newest 4 Comments

Where's the part where they randomly decide to return my backpack via the oversize section or the regular booth? (I should know by now- it's always the opposite of what they tell me). Also, I didn't see the machine that always covers my bag in so much dirt I can't recognize it:-(
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I missed the part where their employees go through your stuff and steal something. (examples: playstation game, bag of candy, cd book, multi tool, etc.)
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Funny, I just flew Delta from LA to NYC - had no issues! Continental was the airline that stole stuff out of my luggage and then refused to reimburse me after I filed a claim.
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I've never had a problem (knock-on-wood) with my luggage during a flight and I thought the video was pretty interesting. I kinda wonder why they blurred the faces of their or the airport's employees - you'd think for this kind of promo they'd want to show the nice, smiling faces of those happy baggage handlers :-) I do kinda wish that Delta had chosen to film this during the day time so, you know, you could actually see what's going on when the bag is outside...
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I like how the bag was "conveniently" placed ever so softly every time a person touched it...riiiiiiiiight...
I also like how all the other bags around it were handled so "gingerly" also.. mmmmm hmmmmmm
I like how the camera never seemed to be perfectly "in frame", with no obstructions or weird angles... hrrmmmm....

having worked at an airport for many years, and actually seeing with my own 2 eyes, this is NOT the average bags journey.. ding ding ding...
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