Extraterrestrials: Where Are They?
Is it possible that extraterrestrial life forms exist within our Galaxy, the Milky Way? This book offers a critical analysis by leading experts in a range of sciences, of the plausibility that other intelligent lifeforms do exist. Exploration of the Solar System, and observations with telescopes that probe deep space, have come up empty handed in searches for evidence of extraterrestrial life. Many experts in the fields of astronomy, biology, chemistry and physics are now arguing that the...
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Experts critically examine the belief that other intelligent life exists in our galaxy. Booknews Experts in astronomy, biology, chemistry, and physics argue that evidence points to the conclusion that technological civilizations are rare. Topics include NASA's high resolution microwave survey, stellar evolution, interstellar propulsion systems, and possible forms of life in environments very different from Earth. This second edition updates papers from a November 1979 symposium and includes three new papers. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Preface to the Second EditionPreface to the First Edition1An Explanation for the Absence of Extraterrestrials on Earth12One Attempt to Find Where They Are: NASA's High Resolution Microwave Survey93An Examination of Claims that Extraterrestrial Visitors to Earth Are Being Observed204The Likelihood of Interstellar Colonization, and the Absence of Its Evidence295Pre-emption of the Galaxy by the First Advanced Civilization346Stellar Evolution: Motivation for Mass Interstellar Migrations407Interstellar Propulsion Systems458Interstellar Travel: A Review509Settlements in Space, and Interstellar Travel7010Terraforming8611Estimates of Expansion Timescales9212A Search for Tritium Sources in Our Solar System May Reveal the Presence of Space Probes from Other Stellar Systems10313Primordial Organic Cosmochemistry10814Chance and the Origin of Life12515The RNA World: Life before DNA and Protein13916The Search for Extraterrestrial Intelligence15217Alone in a Crowded Universe15718Possible Forms of Life in Environments Very Different from the Earth16519Cosmological SETI Frequency Standards17320Galactic Chemical Evolution: Implications for the Existence of Habitable Planets18421The Frequency of Planetary Systems in the Galaxy19222Atmospheric Evolution, the Drake Equation and DNA: Sparse Life in an Infinite Universe215About the Editors and Contributors226Author Index231Subject Index236
\ BooknewsExperts in astronomy, biology, chemistry, and physics argue that evidence points to the conclusion that technological civilizations are rare. Topics include NASA's high resolution microwave survey, stellar evolution, interstellar propulsion systems, and possible forms of life in environments very different from Earth. This second edition updates papers from a November 1979 symposium and includes three new papers. Annotation c. Book News, Inc., Portland, OR (booknews.com)\ \
