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EDITORIAL INFORMATION

This book offers a critical analysis by leading experts in a range of sciences, of the plausibility that other intelligent life forms do exists. 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 now argue that the evidence points to the conclusion that technological civilizations are rare. After ten billion years, and among hundreds of billions of stars, we may well possess the most advanced brains in the Milky Way. This second edition elucidates many new aspects of research on extraterrestrial intelligence life, specially biological considerations of the question.

(Extracted from the back cover).

GENERAL TABLE OF CONTENTS

-Contents.

-Preface to the Second Edition.

-Preface to the First Edition.

-1- An Explanation for the Absence of Extraterrestrials on Earth.

-2- One Attempt to Find Where They Are: NASA's High Resolution Microwave Survey.

-3- An Examination of Claims that Extraterrestrial Visitors to Earth Are Being Observed.

-4- The Likelihood of Interstellar Colonization, and the Absence of Its Evidence.

-5- Pre-emption of the Galaxy by the First Advanced Civilization.

-6- Stellar Evolution: Motivation for Mass Interstellar Migrations.

-7- Interstellar Propulsion Systems.

-8- Interstellar Travel: A Review.

-9- Settlements in Space, and Interstellar Travel.

-10- Terraforming.

-11- Estimations of Expansion Timescales.

-12- A Search for Tritium Sources in Our Solar System May Reveal the Presence of Space Probes from Other Stellar Systems.

-13- Primordial Organic Cosmochemistry.

-14- Chance and the Origin of Life.

-15- The RNA World: Life Before DNA and Protein.

-16- The Search for Extraterrestrial Intelligence.

-17- Alone in a Crowded Universe.

-18- Possible Forms of Life in Environments Very Different from the Earth.

-19- Cosmological SETI Frequency Standards.

-20- Galactic Chemical Evolution: Implications for the Existence of Habitable Planets.

-21- The Frequency of Planetary Systems in the Galaxy.

-22- Atmospheric Evolution, the Drake Equation and DNA: Sparse Life in an Infinite Universe.

-About the Editors and Contributors.

-Author Index.

-Subject Index.

OUR REVIEW

Occasionally, works like this one, free from senseless passions and full of scientific rigour, become quite neecssary. Accustomed as we are to sensationalist texts and books related to the search for extra-terrestrial life, ufology, etc., Extraterrestrials. Where Are They? invites us to a serious, calm reflection, free from prejudices but also with a realistic mind.

This kind of books would not be complete if it lacked some amount of speculation, yet as a general rule, the numerous contributors participating in it, specialists in a given scientific field each one of them, show us a wide, coherent vision of this issue. Thus, several methods for the interstellar voyage are researched and explained, the current status of the SETI research is examined, the possible extraterrestrial biology is explored, etc. It is then a work with its feet firmly stuck on earth, critical with the daring theories on the part of some ufologists, while at the same time being open to challenging proposals which are scientifically sound. This book will surely be liked because of its contents, which will affect our future as a species, as inhabitants of the Cosmos.