This 2023 astronaut photo shows a series of slowly moving "star dunes" in the Erg Chebbi region of Morocco. Most of these massive structures are likely several centuries old.

Down on Mars, Curiosity gives us an incredible panoramic 360° close up look at the Namib Dune, a giant sand ... ripples are spaced about three metres apart, a size not seen anywhere on Earth ...

The wind is continuously moving sand grains up the longer dune slope, towards the top. The small ripples on the slope ... MRO and released by NASA. Images like this are pure eye candy, but they ...

At ground level, the star dunes in Erg Chebbi can look like human-made pyramids when viewed from afar. (Image credit: Getty Images) The largest star dune in Erg Chebbi, Lala Lallia, is 330 feet ...