Signatures of Life

Signatures of Life

Science Searches the Universe

eBook - 2013
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An intriguing overview of the ways in which science could find evidencenbsp;for extraterrestrialnbsp; life
nbsp;
Are we alone in the universe, ornbsp;is life a universal phenomenon?nbsp;nbsp;For fifty years,nbsp;astronomers in SETI (Search for Extraterrestrialnbsp;Intelligence) have scanned the universe for intelligent signals, but with no success. In this intriguing book, Edward Ashpole explains the probable reasons for this and discusses other avenues of investigation more in line with the nature of science and technology.

The author examines the problems inherent in scanning the universe for radio or optical signals from an alien intelligence. Thesenbsp;include the difficulty of trying to communicate with another species possessing a completely unknown form of technology and the vast distances that alien communications would have to travel to reach us.

This leads Ashpolenbsp;to other ways of finding evidence for extraterrestrial life, givennbsp;that advanced civilizations would probably use artificial intelligencenbsp;fornbsp;interstellar travel. Our scientists now know how to detect the presence of life on a planet by observing its spectral lines, so more advanced alien researchers would have had ample time (about two billion years) to investigate these "signatures of life" coming from Earth. Hence, the author argues, alien space probes could exist within our own solar system; there might be evidence on the erosion-free Moon or on another moon or planet. In fact, a few scientists have scannednbsp;NASA's best photography,nbsp;looking for evidence of such "alien archaeology."

In a final chapter, the author urges an open-minded attitude on the part of scientists to allnbsp;credible sources ofnbsp;information, along with the use of the scientific method to test various hypothesesnbsp;and weed out the fantasy factor, which so often interferes with seriousnbsp;attempts to find hard evidence of extraterrestrial intelligence.

Informative and fascinating, Signatures of Life delves into a topic thatnbsp;often provokes wild speculation in a thought-provoking yet scientifically responsible way.


From the Hardcover edition.
Publisher: Amherst, New York : Prometheus Books, 2013
ISBN: 9781616146696
1616146699
Branch Call Number: Overdrive eBook
Characteristics: 1 online resource

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