How do you inform people that this phenomenon has been going on since ancient_times?
1968 saw the publication of a thought provoking book.
https://en.wikipedia.org/wiki/Chariots_of_the_Gods?
https://twitter.com/ancientaliens?lang=en , https://www.imdb.com/title/tt1643266
At one level, it all can be regarded as entertainment, but it's also about getting people to ponder the idea and implications that this ancient universe might host a vast array of intelligent life forms.
https://en.wikipedia.org/wiki/Ancient_Aliens#Production
https://www.space.com/aliens-time-traveling-humans-ufo-hypothesis.html
https://www.nbcnews.com/mach/science/zoo-hypothesis-may-explain-why-we-haven-t-seen-any-ncna988946
