Two eminent scientists debate UFO incidents, persuasive cases, and exploration of what we still need to know about the phenomena. From the outset, Hynek and Vallee make their position clear: UFOs represent an unknown but real phenomenon. The far-reaching implications take us to the very edge of what we consider the known and real in our physical environment. Perhaps, say the authors, UFOs signal the existence of a domain of nature as yet totally unexplored. These two eminent scientists studied the UFO phenomenon for decades and collaborated on this landmark report. In this mind-stretching book, the authors sample UFO reports, including those allegedly involving humanoids, and describe the patterns that have been perceived in the behavior of the phenomenon. They also establish a framework for the further study of the UFO phenomenon. Where might such study lead? What can be studied, and how? What is the real nature of the UFO phenomenon? Does it originate with the actions of other intelligences in the universe? If so, where, and what, might they be? Does the UFO phenomenon have a purely physical explanation, or is there a vaster, hidden realm that holds the solution? These are the questions that have concerned the authors for many years, and it is with possible answers to them that this book is concerned. The Edge of Reality is a deep dive in discussion between Hynek and Vallee and covers many facets of the UFO phenomena such as: The Betty and Barney Hill experience The Calvin Parker Pascagoula case Project Blue Book This is an invaluable work that gives insight into the thinking of Hynek and Vallee's research and investigations into UFOs. The Edge of Reality was original published in 1975 and has been available for many years.