Greene begins with the key question: what is reality? Or more specifically: what is spacetime? He sets out to describe the features he finds both exciting and essential to forming a full picture of the reality painted by modern science. In almost every chapter, Greene introduces basic concepts and then slowly builds to a climax, usually a scientific breakthrough.
Greene then attempts to connect with his reader by posing simple analogies to help explain the meaning of a scientific concept without oversimplifying the theory behind it.
In the preface, Greene acknowledges that some parts of the book are controversial among scientists. He discusses the leading viewpoints in the main text and points of contention in the endnotes. Greene has striven for balanced treatment of the controversial topics. The endnotes contain more complete explanations of points that are simplified in the main text.
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