the 12th planet

I'm in the middle of reading this book called Genesis Revisited by Zecharia Sitchin. This is just one of his books all having to do with the same idea that there is a planet that orbits into our solar system every 3600 years. This planet's inhabitants are responsible for human life coming to be on earth. It also tells the story of how the Earth was created. Supposedly the ancient Sumerians who were visited or created by the people on this orbiting planet (I'm not really sure) know all this stuff about the outer planets that modern science has just discovered within the last 100 years. I think this might be a very plausible idea, (of course I won't hold judgement one way or the other untill I can find some Sumerian texts translated). Has anyone else ever heard of this theory/idea. What do you think is it plausable, I mean with as infinite as space is I think it's ignorant to think we are the only life out there.

Well, I suspect there are plenty of dwarf planets that could fit that description. The only one I could name is Sedna but that has a highly eliptical orbit of about 12050 years and is most certainly incapable of supporting life.
The earliest Sumerian cultures such as Ubaid and Uruk emerged roughly 5300BC and 4100 BC respectively. The civilisation evolved gradually over the millenia and did not show any great leap in advancement.
As for life on other planets, I believe it's not only possible but pretty much a certainty, perhaps even in our own solar system. Some of the moons of the gas giants may harbour microbial life.
Intelligent life on the other hand.. maybe, but that poses all manner of other questions like how would we define 'intelligent'?. I do however, think it is safe to say that we are the only sentient life in this solar system.

Anything is possible! There is a group of African tribesmen I believe called the Dogon who have an elaborate ritual that revolves around a dwarf star. They they have been performing this ritual with masks and a representational headdress of the star revolving in space for thousands of years. Modern science has only discovered it recently and recently being a few decades ago.

They say the Universe has no beginning, middle or end.......what a load! Scientists say that they can still pick up the residual noise of the big bang. How could they pick it up if there were no "walls" for the noise to bounce off of and come back to us?