Updated: 8 FEBRUARY 2012 

Dunes and Ripples in Valles MarinerisDunes and Ripples in Valles Marineris
Two types of wind-blown sedimentary deposits are pictured in this scene of the floor of Ius Chasma in the Valles Marineris.
Looking for an Impact Crater on a DuneLooking for an Impact Crater on a Dune
As of 2011, no craters have been found on Martian dunes,supporting the hypothesis that the dune fields are very young features.
Phoenix Lander Almost 2 Mars Years after LandingPhoenix Lander Almost 2 Mars Years after Landing
This is one of a series of images to monitor frost patterns at the Phoenix landing site.
Spirit Lander and Bonneville Crater in ColorSpirit Lander and Bonneville Crater in Color
This is the first time that HiRISE has imaged the Spirit rover in color, on the west side of Bonneville Crater.

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Dunes and Machines
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