Ancient cultures worship gods that came from the sky
Aliens come from the sky
Ancient cultures worshipped aliens
Many of us have watched ancient aliens, and many of us have thought “oh my god this makes so much sense!” The form of this argument is valid, because the conclusion is consistent with the premises, and the premises are consistent with each-other. This argument follows the a to b, b to c, a to c form. The argument can not be verified because only the first premise is based on a creditable source, we do not know if there are aliens who come from the sky. Because the argument is not factually correct, and is only valid in form, that would make it not sound.
This argument is from the show ancient Aliens, and is the basic belief that the ancient cultures worshipped and where in contact with extra terrestrials that helped them develop technologies and accomplish things that we do not have the ability to accomplish today.