books.google.co.uk - Energy, chemistry, solvents, and habitats -- the basic elements of living systems - define the opportunities and limitations for life on other worlds. This class-tested text examines each of these parameters in crucial depth and makes the argument that life forms we would recognize may be more common...http://books.google.co.uk/books/about/Life_in_the_Universe.html?id=qdjoTGAvrkkC&q=exist&utm_source=gb-gplus-shareLife in the Universe
