,,,including the ones on Mars. The Mars Reconnaissance Orbiter spotted some perfectly circular sand dunes on Mars. Okay, they're a little steeper on the south side, telling us which way the wind goes.
No, we don't know what quirk of local weather is making round dunes, but check this out.
https://scitechdaily.com/strange-circular-sand-dunes-discovered-on-mars-by-nasa-spacecraft/
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