If aliens visited Earth in the past, could they make an appearance in the future? For ancient alien theorists, the answer is a resounding yes. The second is physical specimens such as artwork depicting alien-like figures and ancient architectural marvels like Stonehenge and the pyramids of Egypt. The first is ancient religious texts in which humans witness and interact with gods or other heavenly beings who descend from the sky-sometimes in vehicles resembling spaceships-and possess spectacular powers. Most ancient alien theorists, including von DГ¤niken, point to two types of evidence to support their ideas. He is regarded by many as the father of ancient alien theory, also known as the ancient astronaut theory. In it, he put forth his hypothesis that, thousands of years ago, space travelers from other planets visited Earth, where they taught humans about technology and influenced ancient religions. In 1968, the Swiss author Erich von DГ¤niken published Chariots of the Gods?, which became an immediate bestseller.

The space program played no small part in this as well: If mankind could travel to other planets, why couldn't extraterrestrials visit Earth? The theme of human-alien interaction was thrust into the spotlight in the 1960s, driven by a wave of UFO sightings and popular films like 2001: A Space Odyssey. But how did this concept develop, and is there any evidence to support it?ДЄncient alien theory grew out of the centuries-old idea that life exists on other planets, and that humans and extraterrestrials have crossed paths before. According to ancient alien theorists, extraterrestrials with superior knowledge of science and engineering landed on Earth thousands of years ago, sharing their expertise with early civilizations and forever changing the course of human history.

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