An argument for the Ancient Astronaut theory is the engineering evident in the construction of ancient megalithic sites worldwide; colossal stones, precise cuts, and fitted blocks at many of these sites hint at the prospect of advanced technology.

Ancient Astronaut theorists propose that descriptions of sky gods and star beings might reflect real encounters with extraterrestrial visitors in the remote past.

Throughout history, legendary weaponry and advanced technologies have often been attributed to divine or extraterrestrial influences. Japanese swords were believed to be forged with the help of the supernatural, while mythical weapons granted by otherworldly beings were wielded by iconic figures like Joan of Arc and King Arthur. The enigmatic Greek fire is yet another weapon attributed to these so-called-gods.