Can the quantum theory of fields and Einstein's general theory of relativity, the two most accurate and successful theories in all of physics, be united in a single quantum theory of gravity? On this issue, two of the world's most famous physicists disagree. Here, Stephen Hawking and Roger Penrose explain their positions in a work based on six lectures with a final debate, all originally presented at the Issac Newton Institute for Mathematical Sciences at the University of Cambridge. 75 line drawings.

The Nature of Space and Time 2015, Princeton University Press

ISBN-13: 9780691168449

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The Nature of Space and Time 2010, Princeton University Press, Princeton, NJ

ISBN-13: 9780691145709

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The Nature of Space and Time 2000, Princeton University Press, Princeton, NJ

ISBN-13: 9780691050843

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The Nature of Space and Time 1996, Princeton University Press, Princeton, NJ

ISBN-13: 9780691037912

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