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While the popular TV show “Ancient Aliens” would have you believe that these are representations of extraterrestrials, modern physics can explain their appearance quite easily.
What these “squatting man” symbols represent is an electrical phenomenon known as a High-Current, Z-Pinch Aurora.
According to one study on these ancient symbols, “It is found that a great many archaic petroglyphs can be classified according to plasma stability and instability data. As the same morphological types are found worldwide, the comparisons suggest the occurrence of an intense aurora, as might be produced if the solar wind had increased between one and two orders of magnitude, millennia ago.”
Below we can see what a natural plasma configuration looks like alongside one of the ancient glyphs (left) and what it may have looked like in the ancient sky, similar to our Northern Lights