These enigmatic lunar swirls are the result of ancient underground force fields that shield the moon from barrages of subatomic particles blasted out by the sun.
Each swirl is a meandering blanket of pristine rock interlaced with darkened, radiation-zapped material, making them appear smooth and wispy, unlike the sharp ruggedness of other lunar features.
Observers realized long ago that the swirls cast no shadows, suggesting they can't be topographic features like hills or valleys, but instead resemble collapsed clouds on the surface.
Lunar swirls are easier to spot in the dark maria, as they are brighter than the surrounding dark basaltic plains, indicating a unique formation process.
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