The 12th planet and its alien inhabitants, follow and eliptical orbit, that brings them in close proximity to the earth and they visit the earth and its inhabitants at that time, every 3600 years of earth time.
Well at least this is the claim of an historian and archeologist named Zecharia Sitchin. He has written several books on this and other alien visitations. He includes lots of interesting, -if authentic-, pictures and drawings of objects from several museums to back up his arguments.
He is every bit as convincing and more so than the wbts so if you enjoy this sort of thing, I recommend that you buy some of his books. I think he wrote 6 or 7 and they come in soft back.
He is very convincing and scholarly in his writings. Produces lots of old stone tablets and scrolls and ancient writings and beliefs.
If only there was some way to verify all these claims without a lifetime and a lot of effort and money being spent, it would be great.
Outoftheorg of the if only class.