The sheer enormity of the numbers almost demands that we accept the truth of this hypothesis. Given the fact that there are perhaps 400 billion stars in our Galaxy alone, and perhaps 400 billion galaxies in the Universe, it stands to reason that somewhere out there, in the 14-billion-year-old cosmos, there is or once was a civilization at least as advanced as our own. The proposed solutions run the gamut from the crackpot to the highly serious, but all deserve our consideration.Biogeosciences / astronomy / physics / biology / space science Here are the doubters' arguments, from the Rare Earth theory to the author's own closely argued and cogently stated skepticism. The theories in this camp range widely, from those who believe we simply don't have the technologies to receive or interpret their signals, to those who believe the enormities of space and time work against communication, to those who believe they're actively hiding from us.
Aliens exist, but have not yet communicated. Here are answers ranging from Leo Szilard's, that they are already here and we know them as Hungarians, to those who claim that aliens built Stonehenge and the Easter Island statues. But one of the four, the renowned physicist and back-of-the-envelope calculator Enrico Fermi, asked the telling question: If the extraterrestrial life proposition is true, he wondered, "Where is everybody?" In this lively and thought-provoking 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. Publisher's description: 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 simply had to exist.
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