The Anunnaki and the ancient astronaut theory: where the story actually comes from
The claim that gods from a planet called Nibiru engineered humanity rests on one man's reading of Sumerian tablets. The real history, the actual texts, and where scholars say it breaks.
Cultural history of a contested interpretation. The Sumerian texts are real; the ancient-astronaut reading of them is rejected by mainstream scholarship. Presented as belief history, not fact.

Few UFO-adjacent ideas are as durable as the Anunnaki: the claim that beings from a hidden planet came to Earth in deep antiquity, mined it for gold, and engineered humans to do the labor. It gets told as suppressed history. It is better understood as a 20th-century interpretation laid over genuinely ancient texts, and the gap between those two things is where the whole story lives.
Start with what is real. The Anunnaki were a group of deities in Sumerian and later Mesopotamian religion, named in some of the oldest writing humanity has, going back more than four thousand years. In the actual mythology they are gods. They decree fates, they send a flood, they quarrel among themselves. They are not described as travelers from space. That reading came much later, and from outside the field that studies these texts.
The popular ancient-astronaut genre was launched by Erich von Daniken's 1968 book Chariots of the Gods?, which argued that ancient monuments and myths around the world recorded visits by technologically advanced extraterrestrials. It sold tens of millions of copies and set the template: take an old structure or story, ask what if aliens, then treat the question as if it were the answer.
The specifically Anunnaki version belongs to Zecharia Sitchin, whose 1976 book The 12th Planet claimed to translate Sumerian tablets as a literal record of beings from a planet called Nibiru who created humans as a slave species. Sitchin's Nibiru, swinging in on a long elliptical orbit, is the source of the recurring "Planet X is coming" predictions that have failed on schedule for decades.
Assyriologists, the people who actually read cuneiform, reject Sitchin's translations specifically and pointedly. The words he renders as rocket or spacecraft do not mean that. Nibiru in the texts refers to a celestial body, usually a planet visible in the sky, not a hidden twelfth world. Astronomers add that a large planet on the orbit he described would have announced itself long ago. The objection is not snobbery. It is that the readings do not survive contact with the language.
The ancient-astronaut story endures because it does something the textbooks will not: it makes the deep past feel intentional, and it flatters the present by implying we are owed a secret. Read as cultural history, it teaches you less about Sumer and more about us, about why a postwar, space-age audience wanted its gods to have engines. The tablets are genuinely worth your time. So is the question of why we keep rewriting them.