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Erich von Däniken was a leading proponent of this theory in the late 1960s and early 1970s, gaining a large audience through the 1968 publication of his best-selling book Chariots of the Gods? and its sequels.

Certain artifacts and monumental constructions are claimed by von Däniken to have required a more sophisticated technological ability in their construction than that which was available to the ancient cultures who constructed them. Von Däniken maintains that these artifacts were constructed either directly by extraterrestrial visitors or by humans who learned the necessary knowledge from said visitors. These include Stonehenge, Pumapunku, the Moai of Easter Island, the Great Pyramid of Giza, and the ancient Baghdad electric batteries.

Von Däniken claims that ancient art and iconography throughout the world illustrates air and space vehicles, non-human but intelligent creatures, ancient astronauts, and artifacts of an anachronistically advanced technology. Von Däniken also claims that geographically separated historical cultures share artistic themes, which he argues imply a common origin. One such example is von Däniken’s interpretation of the sarcophagus lid recovered from the tomb of the Classic-era Maya ruler of Palenque, Pacal the Great. Von Däniken claimed the design represented a seated astronaut, whereas the iconography and accompanying Maya text identifies it as a portrait of the ruler himself with the World Tree of Maya mythology.

The origins of many religions are interpreted by von Däniken as reactions to encounters with an alien race. According to his view, humans considered the technology of the aliens to be supernatural and the aliens themselves to be gods. Von Däniken claims that the oral and written traditions of most religions contain references to alien visitors in the way of descriptions of stars and vehicular objects travelling through air and space. One such is Ezekiel’s revelation in the Old Testament, which Däniken interprets as a detailed description of a landing spacecraft.

Von Däniken’s theories became popularized in the U.S. after the NBC-TV documentary In Search Of Ancient Astronauts hosted by Rod Serling and the movie Chariots of the Gods.

Critics argue that von Däniken misrepresented data, that many of his claims were unfounded, and that none of his core claims have been validated.

Zecharia Sitchin’s series The Earth Chronicles, beginning with The 12th Planet, revolves around Sitchin’s interpretation of ancient Sumerian and Middle Eastern texts, megalithic sites, and artifacts from around the world. He theorizes the gods of old Mesopotamia were actually astronauts from the planet “Nibiru”, which Sitchin claims the Sumerians believed to be a remote “12th planet” (counting the Sun, Moon, and Pluto as planets) associated with the god Marduk. According to Sitchin, Nibiru continues to orbit our sun on a 3,600-year elongated orbit. Sitchin also suggests that the asteroid belt between Mars and Jupiter is the shattered remains of the ancient planet “Tiamat”, which he claims was destroyed in one of Niburu’s orbits through the solar system. Modern astronomy has found no evidence to support Sitchin’s claims.

Sitchin claimed there are Sumerian texts which tell the story that 50 Anunnaki, inhabitants of a planet named Nibiru, came to Earth approximately 400,000 years ago with the intent of mining raw materials, especially gold, for transport back to Nibiru. With their small numbers they soon tired of the task and set out to genetically engineer laborers to work the mines. After much trial and error they eventually created homo sapiens sapiens: the “Adapa” (model man) or Adam of later mythology. Sitchin contended the Anunnaki were active in human affairs until their culture was destroyed by global catastrophes caused by the abrupt end of the last ice age some 12,000 years ago. Seeing that humans survived and all they had built was destroyed, the Anunnaki left Earth after giving humans the opportunity and means to govern themselves. Modern archaeologists and experts in the ancient Sumerian culture and language reject every one of these claims insisting Sitchin had simply invented a non-existent Sumerian mythology, that the texts and tablets which Sitchin described do not actually exist, and that the texts of ancient Sumer, Akkad, and Ugarit do not contain any of these stories or even variations on them. It has also been pointed out that many of Sitchin’s translations of Sumerian and Mesopotamian words are not consistent with Mesopotamian cuneiform bilingual dictionaries, produced by ancient Akkadian scribes. The Faculty of Oriental Studies at the University of Oxford has made available an online searchable database with English translations of the entire body of Sumerian literature for comparison.