The big question about UFOs is: where do they come from? There have always been several sides to any discussion of where any UFOs and their occupants might originate – with outer space just one option. But there is another. Because there is support for the existence of UFOs as an historical phenomenon, as well as for them suddenly appearing when we took our first interstellar steps after World War Two.
If they have been ever present in history, UFOs could well not be intelligence-driven at all. They might just be unresolved natural phenomena.
However, if we assume that any of the things seen have an intelligence behind them, then the largest factor
