"A fascinating and useful handbook to both the science and science fiction of extraterrestrial life. Cohen and Stewart are amusing, opinionated, and expert guides. I found it a terrific and informative piece of work–nothing else like it!"      –Greg Bear      "I loved it."      –Larry Niven       "Ever wonder about what aliens could be like? The world authority is Jack Cohen, a professional biologist who has thought long and hard about the vast realm of possibilities. This is an engaging, swiftly moving study of alien biology, a subject with bounds and constraints these authors plumb with verve and intelligence."      –Gregory Benford      "A celebration of life off Earth. A hearteningly optimistic book, giving a much-needed antidote to the pessimism of astrobiologists who maintain that we are alone in the universe–a stance based on a very narrow view of what could constitute life. A triumph of speculative nonfiction."      –Dougal Dixon, author of       After Man: A Zoology of the Future

What Does a Martian Look Like? The Science of Extraterrestrial Life PDF

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