Now in paperback, this first major study of UFOs in decades--written by an astrophysics researcher at Stanford University--reviews the physical evidence for several unexplained sightings within the past 20 years that cannot be dismissed as hoaxes.
Most reports of UFOs are cases of error or merely hoaxes. However a certain percentage defy all rational explanation. This study examines a number of cases that have been well documented and corroborated, yet remain unexplained.