How do you explain these strange dunes on Mars?

How do you explain these strange dunes on Mars?

The Mars Reconnaissance Orbiter camera shows us this amazing photograph of the surface of Mars, which shows dunes of strange shape.

Mars Reconnaissance Orbiter, a NASA spacecraft that has been operating around Mars since 2006, has a habit of making us happy with increasingly exciting images. Its camera, called Hirise, is filming the smallest parts of the planet's surface. It allows scientists to better understand the mechanisms that shape or shape the Martian landscape over time.

Shadow-wind-forming

This time, Hirise shows several sand dunes of very strange shape along the rock in the Canyon of the North, at the North Pole of Mars. This type of entity is quite common on Earth, but also on Mars. They are called velvets. These dunes in the shape of a crescent are usually formed in deserted areas by wind blowing in the main direction. In the shape of the dunes, in particular, on the two semi-month horns, it is possible to determine the direction of the wind.

But the dunes photographed by Mars Reconnaissance Orbiter show more eccentric patterns than usual, and the moons have more complex shapes, indicating that there are vortex winds in this polar region of the Red Planet.

Understanding seasonal changes

In order to take this picture, Hirise used a red-green blue filter that gave the sand a blue shade and allowed a better look at the shape of the dunes. The image covered an area of less than one kilometre and was made from a height of 197 km.

The details of this image will help scientists to better understand the seasonal changes in the weather in the region.