Everything on Ancient Aliens I read in the 70’s in Chariots of The Gods, by Erich Von Däniken ................
https://en.wikipedia.org/wiki/Chariots_of_the_Gods%3F
I cannot defend everything on Ancient Aliens as factual or scientifically provable or even non-silly.
Not all of it is Chariots of the Gods content although the honored precursor of the show is Von Daniken and he is featured often. By the way,he is lovable and all that but was involved at least twice in felony money schemes involving fraudulent credit account transfers years ago.
To extend the series they went far beyond that stuff and are often straining to make connections such as how many oval or circular objects mean The Cosmic Egg is being portrayed. Their egg theory may be cracked (sorry).
I don’t believe their full detailed theories any more than I believe Bill,Hillary,Chelsea,Obama,Comey and Mueller are innocent and deserve to get off while conservatives go to prison.