ARE WE ALONE? Implications of the Discovery of Extraterrestrial Life (1995) by Paul Davies
Full disclosure: I think most UFO reports can safely be dismissed as unreliable or false.
I also think we have underestimated the possibility that intelligent alien life is out there but ignores us - that Earth might be, to use a metaphor, the galactic monkey cage.
The author Paul Davies is no crank; he's a science professional who's written several popular science books on physics and astrophysics. .
ARE WE ALONE? is based on his lectures about the search for extraterrestrial life. He outlines the history of speculation about aliens since antiquity; scientific theories about the number of alien civilizations (and why we haven't found any signs of them); and the actual search for alien communication signals by radio telescope.
Most interesting is Davies' argument that life is NOT a "cosmic accident" but an inevitable product of natural processes. That is, there's no rational reason to assume we are "alone" in the universe, since life will spontaneously emerge elsewhere. .
I recommend this book as an introduction to serious study of SETI (=Search For Extraterrestrial Intelligence), if you can find it.
See also Davies' "sequel" book THE EERIE SILENCE: RENEWING OUR SEARCH FOR EXTRATERRESTRIAL INTELLIGENCE (2010), where he argues that current SETI methods need to be reformed.
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