Strange circular dunes on Mars spotted in these NASA photos

Planetary scientists have captured an image of almost perfectly circular sand dunes on the surface of Mars. While the Red Planet’s sand dunes come in a multitude of shapes and sizes, such well-defined circles are unusual.

The slight asymmetry of the sand dunes shows that their steep sides face south. The University of Arizona, which operates the High-Resolution Imaging Experience (HiRise) camera used to take the image, shown in a statement (opens in a new tab) that this indicates that the sands are blowing south, although Martian winds can be variable.

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