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Some writers have proposed that intelligent extraterrestrial beings have visited Earth in antiquity or prehistory and made contact with humans. Such visitors are called ancient astronauts or ancient aliens. Proponents suggest that this contact influenced the development of human cultures, technologies and religions. A common variant of the idea is that deities from most, if not all, religions are actually extraterrestrials, and their advanced technologies were wrongly understood by primitive men as evidence of their divine status.

These proposals have been popularized, particularly in the latter half of the 20th century, by writers such as Erich von Däniken, Giorgio A. Tsoukalos, Zecharia Sitchin, Robert K. G. Temple, David Icke and Peter Kolosimo, but the idea that ancient astronauts actually existed is not taken seriously by most academics, and has received little or no credible attention in peer reviewed studies. Ancient astronauts have been widely used as a plot device in science fiction.

Proponents of ancient astronaut theories often maintain that humans are either descendants or creations of extraterrestrial beings who landed on Earth thousands of years ago. An associated idea is that much of human knowledge, religion, and culture came from extraterrestrial visitors in ancient times, in that ancient astronauts acted as a “mother culture”. Ancient astronaut proponents also believe that travelers from outer space known as “astronauts” or “spacemen” built many of the structures on earth such as the pyramids in Egypt and the Moai stone heads of Easter Island or aided humans in building them.

Proponents argue that the evidence for ancient astronauts comes from supposed gaps in historical and archaeological records, and they also maintain that absent or incomplete explanations of historical or archaeological data point to the existence of ancient astronauts. The evidence is said to include archaeological artifacts that they argue are anachronistic or beyond the presumed technical capabilities of the historical cultures with which they are associated (sometimes referred to as “Out-of-place artifacts”); and artwork and legends which are interpreted as depicting extraterrestrial contact or technologies.

Certain mainstream academics have responded that gaps in contemporary knowledge of the past need not demonstrate that such speculative ancient astronaut ideas are a necessary conclusion to draw. Francis Crick, the co-discoverer of the double helix structure of DNA, however strongly believed in what he called panspermia, the concept that earth was ‘seeded’ with life, probably in the form of bluegreen algae, by intelligent extraterrestrial species, for the purpose of ensuring life’s continuity. He believed that this could have been done on any number of planets of this class, possibly using unmanned shuttles. He talks at length about this theory in his book Life Itself.

Thomas Gold, a professor of astronomy, suggested a “garbage theory” for the origin of life, proposing that life on earth might have spread from a pile of waste products accidentally dumped on Earth long ago by extraterrestrials.

The television series Ancient Aliens on the History channel features the main proponents in the ancient astronaut theory, and includes interviews with Giorgio A. Tsoukalos, David Childress, Erich von Däniken, Steven Greer and Nick Pope.

Paleocontact or “ancient astronaut” narratives first appear in early science fiction of the late 19th to early 20th century. The idea was proposed in earnest by Harold T. Wilkins (1954) and it received some consideration as a serious hypothesis during the 1960s, and has been mostly confined to the field of pseudoscience and pop culture since the 1970s. Ancient astronauts appear as a feature of UFO religions beginning with the Space opera in Scientology scripture (1967), followed by Raelism (1974).