Carl Sagan, Thornton Page | 1974 | ISBN: 0393007391 | English | 310 pages | PDF | 13 MB

Scientists examine photographs, sighting reports, and radar tracings to analyze the possibility of alien visitors to Earth.

The order of presentation of topics in this book has been slightly altered from that in the original symposium for reasons of coherence. The first section is introductory and historical; the second is largely devoted to the observations and debates on their interpretation; the third, to social and psychological aspects of the UFO problem; and the fourth is a retrospective and perspective. The participants are astronomers, physicists, sociologists, psychologists, psychiatrists, and a representative of the communications media, and they include most of the scientists primarily involved in discussion of UFO's over the years.
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