This book collects all the information about what worlds an alien species could develop on, ranging from parts of the galaxy, stellar types, solar system configurations, satellites, and much more. It provides a plausible explanation of how alien life might form and then evolve up to intelligence. It is part of a planned trilogy, with the other two books covering alien civilizations and interstellar travel. The book is an excellent reference for detecting when science fiction has departed too far from reality. One section describes why alien study is important for us, and what social and other changes might happen to us if aliens were ever discovered on some distant exo-planet. It provides a comparison of the principal theories of the origination of life, and what has to happen if some species ever evolves intelligence. Since it covers so many different areas of science, it is an good book for anyone interested in seeing how different topics fit together to come up with a comprehensive review of what it takes to have aliens.
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