Science
NASA has presented amazing photos of sand dunes on Mars.
For the first time, scientists have been able to study active sand dunes on another planet.
The Curiosity rover has been on the surface of the Red Planet for more than three years, and it has finally managed to take these impressive images.
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Although Curiosity has taken photos of sand dunes before, it has never been possible to see them up close.
Photos from Mars
The photographs show the huge, rippled Namib dunes, 4-5 meters high, located in the Bagnold Dunes on the northeast side of the base of Mount Sharpe, which forms the central peak in the crater Gail.
Gale Crater is where the Curiosity rover first landed in 2012.
The ripples on the dunes are changing due to Martian winds and small avalanches. The sand settles on the slopes due to the wind. When the lower layer of sand can no longer hold the weight of the sand from above, a small avalanche occurs.
