ancient astronaut hypothesis

Noun (1)

1. a pseudo-scientific hypothesis that posits that intelligent extraterrestrial beings have visited Earth and made contact with humans in antiquity and prehistory.“Sagan argued that while many legends, artifacts and purported out-of-place artifacts were cited in support of ancient astronaut theories, ‘very few require more than passing mention’ and could be easily explained with more conventional theories.”Synonyms: paleocontact hypothesisType of pseudoscience