This is a book about the technology and propulsion of the crafts (shuttles and cruisers) of the Alien Visitors. If you ever wondered how these UFOs and "Flying Saucers" can traverse great distances in space - you will get some of the answers. They (the Alien Visitors) and their crafts display technology far beyond anything ever seen on Earth. Photographic evidence will support the text examples. | The Alien Visitors by Rene Erik Olsen, Paperback | Indigo Chapters