Evolving the Alien: The Science of Extraterrestrial Life (Hardcover)

They use fictional aliens to show what could (and couldn't) possibly exist, and also include a theory as to how tribbles could actually have evolved. This also had the excellent side-effect of introducing me to a whole load of new novels that I would probably not have read if they hadn't had a mention in this book. There is also a short story running throughout the book about a pair of aliens who run holidays to earth, which illustrates how hard it would be to recognise extra-terrestial intelligent life even if it were sharing a beach with us. All in all a very informative and interesting book that opened my mind up to a whole new range of possibilities for alien life that I had never even considered.

Note "places," since Cohen and Stewart don't limit their conjectures to planets alone. Noting the impact of H.G. Wells' "War of the Worlds" as a starting point for how we think about life elsewhere, Cohen and Stewart divide the book between evidence from hard science and the conjectures of "SF" [speculative fiction] authors. Including themselves. In their view, both exobiologists and novelists have been remiss in considering how alien life might evolve. They do a comprehensive job, presented with the kind of wit expected of collaborators of Terry Pratchett of Discworld fame.

Recognizing they are entering a relatively unexplored area, they abandon old terms like "astrobiology" or "extraterrestrial life" to suggest a new, all encompassing term - xenobiology. They condemn outright the narrow views expressed by some scientists, notably Peter Ward and Donald Brownlee in "Rare Earth." Cohen and Stewart argue that limiting life to DNA-based forms is far too restrictive. Different environments are capable of producing life in ways "we can't even imagine." Magnetic fields in suns or neutron stars, silicon-based chemistry, unusual energy uses are all part of the panorama nature has in its recipes in making life start. Our localized experience is too limited, they argue, and we should look further with more open minds.

Those who have attempted a more open view have traditionally been limited to writers of speculative fiction. Cohen and Stewart sprinkle the text with examples of this genre, accompanied by an analysis of what is right or wrong with the ET life presented. "Science fiction" might just as easily be labelled "fictional science" in the eyes of these authors. Too little attention has been given to environmental complexity by the legions of writers seeking to entertain readers with simple plots and much action. Among that phalanx, however, there are some writers who strive to bring reality to the fictional worlds they create. Jack Cohen has been called into the story-building process as a consultant by several authors. The result, once the dust had settled, was SF with a reality check. The authors give accounts of some of
these efforts and the resulting books should be sought out and compared to those less favoured by the authors of this book.

Jack&Ian [as they style themselves] have provided a rich trove of ideas for nearly everyone. Scientists can gain fresh areas of research to consider, while fiction readers may find a whole new list of interesting readings. The book isn't footnoted, but there is a divided bibliography of "Popular Xenoscience Reading" and "Technical Xenoscience Reading" at the end. If you fail to find new concepts to consider here, you haven't tried.

Note "places," since Cohen and Stewart don't limit their conjectures to planets alone. Noting the impact of H.G. Wells' "War of the Worlds" as a starting point for how we think about life elsewhere, Cohen and Stewart divide the book between evidence from hard science and the conjectures of "SF" [speculative fiction] authors. Including themselves. In their view, both exobiologists and novelists have been remiss in considering how alien life might evolve. They do a comprehensive job, presented with the kind of wit expected of collaborators of Terry Pratchett of Discworld fame.

Recognizing they are entering a relatively unexplored area, they abandon old terms like "astrobiology" or "extraterrestrial life" to suggest a new, all encompassing term - xenobiology. They condemn outright the narrow views expressed by some scientists, notably Peter Ward and Donald Brownlee in "Rare Earth." Cohen and Stewart argue that limiting life to DNA-based forms is far too restrictive. Different environments are capable of producing life in ways "we can't even imagine." Magnetic fields in suns or neutron stars, silicon-based chemistry, unusual energy uses are all part of the panorama nature has in its recipes in making life start. Our localized experience is too limited, they argue, and we should look further with more open minds.

Those who have attempted a more open view have traditionally been limited to writers of speculative fiction. Cohen and Stewart sprinkle the text with examples of this genre, accompanied by an analysis of what is right or wrong with the ET life presented. "Science fiction" might just as easily be labelled "fictional science" in the eyes of these authors. Too little attention has been given to environmental complexity by the legions of writers seeking to entertain readers with simple plots and much action. Among that phalanx, however, there are some writers who strive to bring reality to the fictional worlds they create. Jack Cohen has been called into the story-building process as a consultant by several authors. The result, once the dust had settled, was SF with a reality check. The authors give accounts of some of
these efforts and the resulting books should be sought out and compared to those less favoured by the authors of this book.

Jack&Ian [as they style themselves] have provided a rich trove of ideas for nearly everyone. Scientists can gain fresh areas of research to consider, while fiction readers may find a whole new list of interesting readings. The book isn't footnoted, but there is a divided bibliography of "Popular Xenoscience Reading" and "Technical Xenoscience Reading" at the end. If you fail to find new concepts to consider here, you haven't tried. [stephen a. haines - Ottawa, Canada]

The book combines with clarity, wisdom and humour the fields of biology, astrophysics and statistics, but also draws on inspiration from a myriad of the more imaginative sci-fi stories. It does an excellent job of demolishing the "Rare Earth" hypothesis, demonstrating the flaws in the logic of classic 'habitable zones' and many of the other points. It brings up many theories from astrobiology and xenoscience, pointing out their strengths and limitations - for example, the implicit 'field theory' of the SETI Drake Equation.

The book's most fascinating points however lie in its analysis of modern, cutting edge biology - looking at the extreme environments and self-complicating chemistries that can, and will, lead to life, citing evidence found on our own planet. It explores what we can learn by looking at the general mechanisms of evolution, and attempts to extrapolate and separate features specific to Earth and those that should hold universal, throughout the universe.

All in all, the authors' writing style is extremely readable, and it is difficult to put the book down. A thoroughly enlightening read!