"Do we have evidence that aliens have tried to visit Earth? How are reports of unidentified flying objects, or UFOs, explained? Get the facts. The book The Alien Files, chapter one looks at reports of aliens on Earth and sightings of UFOs. It identifies the three most common alien forms and discusses how fake photographs are created. Chapter two discusses the 'Roswell Incident', displays a scale for measuring encounters with aliens and includes information on 'Men in Black'. Chapter three looks at the expanse of the universe and how scientists are exploring space, looking for signs of alien life"--Publisher's description.