a) Andy Lloyd's Dark Star Theory - This website discusses the existence of an additional, massive planet in our solar system, which I have named the 'Dark Star'. It goes by many other names: Nibiru, Planet X, The Destroyer. Some consider this object, which is spoken of in many mythical writings, to be a regular planet in an elliptical orbit. This website explores a bolder idea:
b) Neal Stephenson's Tale of Two Planets - Neal Stephenson's new novel Anathem... there's something very timely about his tale of aliens on a parallel Earth whose inhabitants are locked into an occasionally-catastrophic conflict between scientific and religious institutions:
