References: (1) https://mars.nasa.gov/resources/5874/opportunitys-rub-al-khali-panorama/ https://mars.nasa.gov/resources/5874/opportunitys-rub-al-kha... (2) h

References: (1) https://mars.nasa.gov/resources/5874/opportunitys-rub-al-khali-panorama/ https://mars.nasa.gov/resources/5874/opportunitys-rub-al-kha... (2) https://en.wikipedia.org/wiki/Rub%27_al_Khali https://en.wikipedia.org/wiki/Rub%27_al_Khali (3) https://en.wikipedia.org/wiki/Namib https://en.wikipedia.org/wiki/Namib (4) https://www.nasa.gov/image-feature/jpl/slip-face-on-downwind-side-of-namib-sand-dune-on-mars https://www.nasa.gov/image-feature/jpl/slip-face-on-downwind...