content: I have read other reviews on amazon about this book and am slightly disappointed. Those who are true sci-fi fans do there best to see the big picture but let bits and pices of rational thought slip so they can take in the fantasay of it all. Some who have reviewed this book have not looked at things with an open mind all the way. This text is wonderfully written and in time will be one of the sci-fi treasures of the 20th century. Aldrin has lent his insight of alien worlds come through, but Barnes has certanly worked all the magic. If you are a true sci-fi fan this is a must read.