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If craters on the Moon are solely due to impact, as many believe, then we should expect craters to be randomly distributed. Some shielding from Earth would be expected, but for the rest, the craters should appear with no clear pattern.

However, this isn’t the case. Small craters are predominantly located on peeks and ridges. They often appear on the edges of older, bigger craters, or lined up neatly along a ridge.

Electrical cratering on exposed edges
Electrical cratering on exposed edges

Larger craters are uniformly spread out. Viewed from the north pole or south pole, a spiralling pattern of large craters can be seen.

This indicates some sort of continuous process in which craters are excavated slowly over time.

Ion winds could do this. Charged particles move along the surface of our Moon until they find a suitable escape point, usually on a ridge or other high point. They spiral around the escape point a few times before leaving the surface.

Over time, craters appear, evenly spaced out, themselves forming a spiralling pattern due to the way electric currents spiral and even out charge as much as possible.

Lunar north pole By NASA/GSFC/Arizona State University - (see also, Public Domain,
Lunar north pole By NASA/GSFC/Arizona State University - (see also, Public Domain,

The craters on the Moon are not proof of a violent past, but mostly the result of dust and other particles fluttering along its surface.

Impact craters are relatively rare in comparison to electrically excavated craters.

As an interesting aside the south pole of our Moon has deeper craters than the north pole. This indicates that the current running across the surface of our Moon is from south to north.

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