astroengine writes: "Etched across the surface of the moon are vast and often complex swirls in the lunar regolith. The Apollo astronauts saw them and our current orbiting lunar satellites are seeing them. But how did they get there? Is the solar wind to blame? Or is it the internal magnetic structure of the moon itself? Or is it perhaps something a little more extraordinary? Scientists, for now, don't have a clue."
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