re: re:Victor Clube and Bill Napier?
There are these two astronomers named Victor Clube and Bill Napier, who have written two books: "The Cosmic Serpent" and "The Cosmic Winter". In them they argue that many events in the past like angles in the Bible talking of disaster are in fact related to comets and "space dust" and I think impact events. These events include the fall of the Roman Empire and the beginning of the Dark Ages.
David Morrison is skeptical of the relationships.