If you read this................ https://en.wikipedia.org/wiki/Extraterrestrials_in_fiction ................ You will see that the 'aliens' or 'ufo's' were described as Demons or Angels in stories of old.
The words of 'extraterrestrial' are a modern term from the 1940's/50's.
The words of 'extraterrestrial' are a modern term from the 1940's/50's.