Sorry, but I find the idea of ancient aliens as ridiculous as as the belief in talking snakes. Fanciful interpretations of ancient artists out of context is not a science and has provided no real evidence. Everywhere our advanced culture goes in leaves behind evidence of our technologies, advance alien cultures would have done the same, so where are these? Human likely witnessed cosmic events in the past these unexplained observations would have left impressions on the beliefs of the peoples observing them.