Zecharia Sitchin is an anthropologist that promotes an explanation for human origins involving ancient astronauts. Sitchin attributes the creation of the ancient Sumerian culture to the Anunnaki, which he states was a race of extra-terrestrials from a planet beyond Neptune called Nibiru. He believed this hypothetical planet of Nibiru to be in an elongated, elliptical orbit in the Earth's own Solar System, asserting that Sumerian mythology reflects this view. Its a bit wacky to read but way fun once you get into his mind set. Its like learning history on acid. If you feel like taking a trip down the rabbit hole, read some of his stuff.
speak to me ancient astronauts!