Evolving the Alien
Evolving the Alien: The Science of Extraterrestrial Life is a 2002 popular science book about xenobiology by biologist Jack Cohen and mathematician Ian Stewart.
The concept for the book originated with a lecture that Cohen had revised over many years, which he called POLOOP, for "Possibility of Life on Other Planets".
Synopsis
Cohen and Stewart argue against a conception of extraterrestrial life that assumes life can only evolve in environments similar to Earth, and that extraterrestrial lifeforms will converge toward characteristics similar to those of life on Earth, a common trope of certain science fiction styles. They suggest that any investigation of extraterrestrial life relying on these assumptions is overly restrictive, and it is possible to make a scientific and rational study of the possibility of life forms that are so different from life on Earth that we may not even recognise them as life in the first instance.Cohen and Stewart return to two contrasts throughout the book. The first is between exobiology and xenoscience. The second contrast drawn is between parochials and universals.
Cohen and Stewart supplement the limited hard science available on their subject with numerous references to science fiction of both their own and others' creation, including 28 plot summaries of classic SF stories.
Reception
In its review of Evolving the Alien, the London Review of Books commented that Cohen and Stewart's speculative approach is useful in exposing errors in conventional thinking, and is "painlessly educative" on the current state of the applicable sciences, but criticized their "naive optimism" with respect to future technological breakthroughs in human space travel.In his review for Nature, Lawrence M. Krauss admitted to not being completely sure of the book's intended goal and audience, but noted that it may serve as a counterpoint to arguments put forth in Peter Ward and Donald Brownlee's book, Rare Earth.