Are We Alone?
by Gregg Easterbrook
Publisher: The Atlantic Monthly 1988
Scanning the universe to see if we have company has fallen out of favor among many scientists, but the true believers who continue to search raise diverting questions -- like why planets form where they do, and how life began, and where we might end up.
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by Philip Morrison, John Billingham, John Wolfe - NASA
In the late twentieth century, scientists converged upon the basic idea of scanning the sky and 'listening' for non-random patterns of electromagnetic emissions in order to detect another possible civilization somewhere else in the universe.
by Alfred R. Wallace - Chapman and Hall
Contents: early ideas; modern ideas; the new astronomy; the distribution of the stars; distances of stars - the sun's motion; unity and the evolution of the star-system; are the stars infinite?; our relation to the Milky Way; and more.
by G. Gonzalez, D. Brownlee, P. Ward - arXiv
The GHZ is that region in the Milky Way where an Earth-like planet can retain liquid water on its surface and provide a long-term habitat for animal-like aerobic life. In this paper we examine the dependence of the GHZ on Galactic chemical evolution.
by Stephen H. Dole - RAND Corporation
The book examines and estimates the probabilities of finding planets habitable to man and where they might be found. The author presents in detail the characteristics of a planet that can provide an acceptable environment for humankind.