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During a lunchtime conversation at Los Alamos more than 50 years ago, four world-class scientists agreed, given the size and age of the Universe, that advanced extraterrestrial civilizations had to exist. The sheer numbers demanded it. But one of the four, the renowned physicist and back-of-the-envelope calculator Enrico Fermi, asked the telling questions: If the extraterrestrial life proposition is true, he wondered, “Where is everybody?”
In this book, Stephen Webb presents a detailed discussion of the 50 most cogent and intriguing answers to Fermi’s famous question, divided into three distinct groups: aliens are already here among us. Here are answers ranging from Leo Szilard’s, that they are already here and we know about them as Hungarians, to those who claim that aliens built Stonehenge and the Easter Island statues; aliens exist, but have not yet communicated. The theories in this camp range widely, from those who believe we simply…[more]