In this exciting new book, distinguished paleontologist Peter D. Ward and noted astronomer Donald Brownlee team up to present a fascinating synthesis of what is now known about the development of life on Earth and how this sheds light on possibilities for organic life forms elsewhere in the Universe. With their broad expertise and wonderful descriptive imagery, the authors provide a compelling argument, a splendid introduction to the emerging field of astrobiology, and a lively discussion of the remarkable findings that are currently being generated.