P. C. W. Davies

This was an engaging, enlightening but in the end almost depressing book. Beside the awesome physical impediments of distance and time to preclude meaningful communication with an alien civilization, Davies etches deeps the facet of this issue I have considered before: a civilization possibly a million years older than ours may be so advanced as to be incomprehensible/undetectable. Our radio telescope basis assumes primitive and lossy communications by others. We may as well use smoke show more signals.

Intriguing to me is the author's suggestions to look for alien artefacts, beacons. and extraterrestrial microbes thriving in extremeophile conditions or even common ocean water. show less

Book review by erasmusdarwin (Tim Jones): The Eerie Silence: Are We Alone in the Universe?

Author: Paul Davies

Hardcover: 260 pages
Publisher: Allen Lane (4 Mar 2010)
ISBN-10: 1846141427
ISBN-13: 978-1846141423

The search for extra-terrestrial intelligence, or SETI, is in a rut. That is Paul Davies’s message in ‘The Eerie Silence – Are we alone in the Universe’ – a thorough taking stock of the programme started by Frank Drake in 1959 to search for alien radio messages from outer show more space.

Davies wants a rethink from scratch, where we shake off the blinkers of anthropocentric thinking and question exactly what we should be looking for. Listening out for a direct radio message is fine, but lets extend the search to include more subtle evidence of alien legacy and the very origin of life.

ET has indeed been strangely quiet, and for Davies two rather extreme explanations for that are providing signposts to a ‘New SETI’.

Under the first option, we have to accept that life on Earth was born of a series of events so incredibly flukey they will never be repeated. Under the second, we face the chilling prospect that intelligent life pops up quite frequently, only to develop a propensity for technology fueled self-destruction.

Holding out hope for a middle way, and putting speculation over self-destructing aliens aside, Davies argues there is a raft of solid science we could be getting on with to better understand the scarcity of life. Those up for the task (and skilled enough to secure funding) will enter a field of polarised opinions and a paucity of hard evidence. The prize? – possibly the final word on the question of whether life is ubiquitous in the universe – a ‘cosmic imperative’ - or that you and I here on Earth are a one-off, somewhat lonesome, rarity.

We should still listen for radio messages, says Davies, enthusing over SETI’s groundbreaking Allen Telescope Array (ATA) of radio telescopes; but the emphasis should be on searching for new types of evidence of intelligence, both in space and closer to home – on Earth in fact.

If we can show life on Earth started independently more than once – a second genesis if you like - the fluke theory is destroyed and the prospect of life existing on the billion or so Earth-like planets in our galaxy increases immensely. Once life has started, there is pretty much universal agreement among scientists that Darwinian style evolution will, environmental factors willing, take over to produce complex life forms and probably intelligence and consciousness. Second (and third and fourth..) genesis life forms could be living alongside us today, unrecognised as a microbial ’shadow biosphere’ – the holy grail for researchers now culturing candidate samples from Mono Lake in California. Or we might find tell-tale markers of an extinct second genesis in geological records that we have seen but incorrectly interpreted. With so many work areas highlighted as candidates for inclusion in New SETI, a problem for potential researchers could be deciding where to focus their application. Presumably Davies is taking calls.

Moving from Petri dish to telescope dish, Davies believes our pre-conceptions of ET in space are causing us to define too narrow a target there also. Any intelligent biological life, he says, will quickly transition to an intellectually superior machine form having nothing in common with Homo sapiens and little to gain from interstellar chit-chat.

Or the aliens may have launched beacons that ping data packets only once a year. Or they may have sent probes – monolith fashion – to lurk around our solar system, programmed to spring to life when we learn to think up to their level. The point is we will only detect this kind of activity if we specifically look for it.

In his most futuristic speculation, Davies envisions life evolving into a quantum computer – an extended network of energy floating through space, amusing itself solving complex mathematical doodles. The implication of course, if such ‘beings’ exist, is that we are headed in the exact same direction. How do you fancy being a node in a pan-galactic thought matrix?

Among other thought-provoking revelations, we learn the Earth has for billions of years been happily swapping rocks, possibly with primitive life aboard, with other planets in the solar system – including Mars. That makes the potential discovery of life on that planet important, but not necessarily a game-changer for SETI, as Martian and Earth life could share the same unique origin.

Davies puts SETI into historical context on a quirkier note, recounting how the mathematician Karl Gauss, as early as the turn of the 19th century, planned to signal the Martians using huge shapes cut out of trees in the Siberian forest.

There is an implicit appeal in The Eerie Silence for scientists from different disciplines to work together on SETI and astrobiology – maybe a guiding principle for New SETI? Astronomers, biologists, geologists, engineers, astro-physicists and cosmologists all have a role in the search – as do non-scientists.

That also holds true for the post-detection task-group Davies leads, set up to advise an appropriate response in the event ET finally calls. In a chapter devoted to the implications of ‘first contact’, he asks how various groups: from the media, through politicians, the military, and religious believers might react. If we receive a targeted message, we should certainly think carefully about the reply. But that we already send the occasional burst of blindly targeted radio messages into space is a positive in Davies’s book; at least it makes people think about science, humanity, and what in our culture we value. Religion, and particularly Christianity, Davies believes, will struggle to reconcile dogma with the existence of intelligent aliens.

In his wind-up, Davies keeps all options open as to the chances of a positive outcome for SETI. But on balance, hardcore enthusiasts of radio SETI in particular may well find the The Eerie Silence a bit of a downer. Likewise, those looking for evidence to support more philosophical ideas around nature favouring life, or the existence of a life principle buried in the physics and chemistry of the universe – themes Davies has arguably been more sympathetic to in previous works – will be disappointed as he rejects each in turn.

To its credit, The Eerie Silence is as much about human motivations and psychology as it is about research and radio antennae. A chatty narrative with frequent episodes of self-examination strikes chords with thoughts and feelings most of us will have had: like the need for a sense of self, and a yearning for meaning. The search for ET is very much the search for what we are, what we may become, and what ‘it’ all means. A cliched theme maybe, but well supported here with relevant facts and reasoned speculation. Davies’s talent for projecting rock-solid scientific rationalism while not (entirely) closing the door on other perspectives has produced an absorbing read.

Originally posted at:
http://communicatescience.com/zoonomian/2010/03/26/book-review-the-eerie-silence... show less

Perhaps it was inevitable that my fondness for novels involving time travel would lead me to this slim but fascinating non-fiction work by physicist, Paul Davies. Despite the provocative title, Davies doesn’t actually give step-by-step instructions for building a time machine in your garage, more’s the pity. But he does explain in plain English why we’re already time travelers (moving toward the future at the stately pace of one second per second) and how the universe just might allow show more us to do far more—eventually. Want to get to Year 3000 in a hurry? Build a rocket that can attain 99.999999999% of the speed of light and you’ll be there in six months. Want to get back now from then, or visit some other time that relative to now is in the past? You’ll need a wormhole and Davies provides helpful, if daunting instructions for building one. If a traveler from the future ever does show up, don’t be surprised if he’s got a copy of this book in his back pocket. show less

Everywhere you look there exists complexity. Nature, our lives, the universe, the environment, economics, politics, sociology—all of it is incredibly complex. But, can we talk about complexity? Is complexity too complex to discuss? It the risk of sounding like a metaphysical junkie, the answer to that is both simple and complex. Charles Lineweaver, along with Paul Davies and Michael Ruse, bring together some perspectives on the question (and maybe the answers) of complexity in Complexity show more and the Arrow of Time. Along the way, we get a series of answers from a cosmological, biological, and even a philosophical point of view.

First off, I’m not even going to act like I knew about everything that was going on in this book. I’m lucky if I understood even one-third of the ideas being bandied about, but that small percentage was still enough to keep me interested. David Wolpert and David Krakauer go little overboard on the equations and theories in their sections, but they try to look at evolution and complexity from a purely mathematical perspective. Eric Chaisson tries to unify complexity across the sciences by defining complexity as a measurement of energy usage; celestial bodies become more complex over time as they burn through energy, biological entities require more energy as complexity increases, and humans through history have required more energy as their technologies have grown increasingly complex. Michael Ruse looks at complexity as described by Darwinian theory and debates whether the analogy of complexity to success to dominance is really true.

All these essays (and quite a few more) helped to create a picture of complexity on many levels. Interestingly enough, there is an underlying urge to simplify complexity. When greeted with the utter chaos of quantum theory and biological systems, there is an impetus to organize, but it always eludes us. This collection is at least a nudge in the right direction when we start talking about complexity at a macroscopic level. A heady but still intriguing read. show less