Dune fields on Mars
The Martian surface is a curious one; many features on it are mirrored on Earth, allowing astronomers to draw conclusions about its history based on Earth-based observations. In this instance, NASA’s Mars Reconnaissance Orbiter has pictured a region known as the Coprates Chasma and its dune fields.
These regions are more specifically known as ‘wall dune fields’ as they are located along canyon wall slopes. They occur due to the downward transport of dune sediment from airflow erosion, amongst other processes. Dune fields such as these tell astronomers a lot about the planet's processes of which make short work of shaping these features.