MSL Curiosity Approaching a Sand Dunehttp://astrogeology.usgs.gov/news/astrogeology/sol-528-update-on-curiosity-from-usgs-scientist-ken-herkenhoff-looking-back-at-purgatory-dune- by markbnine • 12 years ago 1 0 12 years agoASastrogeology.usgs.gov