What are people seeing? What are those strange lights in the night sky? How do you explain bodiless voices & apparitions that appear and dissipate before your very eyes?. Are there really aliens from planets that are light-years away? Are ghosts real? - There are many theories, some more plausible than others however, There may be a theory that will tie most of these paranormal activities together and if true answer the question "What was that?"
PS: I posted this earlier but some people said the link didn't work,