According to Sitchin, the Earth was visited by advanced extraterrestrial beings, known as the Anunnaki or Nephilim, who arrived on our planet about 450,000 years ago. These beings allegedly came from a hypothetical planet called Nibiru, which orbits the sun every 3,600 years. The Anunnaki, Sitchin claims, were interested in Earth's resources, particularly gold, which they needed to repair their planet's atmosphere.
The book expands on Sitchin's theory that humans were genetically engineered 300,000 years ago by adding Anunnaki genes to a local hominid. The Royal Tombs of Ur: hubo gigantes en la tierra zecharia sitchin pdf
Sitchin claimed that before perfecting the standard human model, there were failed experiments. Some of these experiments resulted in hybrids of . These were the true Nephilim —not angels, but giant hybrid beings. According to Sitchin, the Earth was visited by
