Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: The Next Frontier

When talking about the exploration of space, and in particular of the planet Mars, it is easy to fall into one of two categories : a) Over-technical b) Over-fantastic.Fortunately, this book avoids both of those paths. Don't misunderstand - this is for those with a technical/scientific bent, but can be understood by lay-people. It is a high quality astronautical engineering book, focusing on the _how_, but pause is also given to the more human side, the _why_ - why go, why explore. Contributors of chapters come from reputable and solid backgrounds, with ideas that are backed not only by imagination, but with engineering know-how.In short, this book provides a valuable reference for those interested in the technical aspects - if I win the fifty dollars for a review, I know what I'll ask for...