UFO: Strange Space on Earth

Are we alone in the universe? Might we have company? Is Earth really being visited by curious entities from other worlds? Why are UFOs so elusive? Could they be something else entirely? In this detailed little book, top UFO researchers Paul Whitehead and George Wingfield tell the story of UFOs from their first appearance in cave art and the Bible, through folklore and science fiction, to the ongoing, reliable and extraordinary sightings of the last fifty years.