Planetary scientists have obtained a picture of the unique sand dunes on Mars. Dunes are quite common on the Red Planet, but such an almost perfectly round shape is rare, according to Space.. com.

The slight asymmetry of the sand dunes shows that their steep slopes are oriented to the south.. This means that the sand is blown in this direction, although the Martian winds are changeable..

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A series of images of the dunes was taken in November last year.. They are used to observe the retreat and melting of frost on Mars as the planet enters the spring period..

The researchers also took pictures of the dunes when they were covered in frost to compare their appearance at different times of the year..

The images of the dunes were made by the MRO apparatus, which is located at an altitude of 300 kilometers above the surface of Mars.

Previously, the Curiosity rover discovered a rock covered with traces of waves on the Red Planet. This is evidence of the presence of an ancient lake. It is noted that it existed in the region of the Red Planet, which was considered drier.