We shall assume a basic knowledge of general relativity and quantum theory. I should emphasize that these will be technical lectures. We shall speak alternately and shall give three lectures each, followed by a discussion on our different approaches. In these lectures, Roger Penrose and I will put forward our related but rather different viewpoints on the nature of space and time. ![]() Though much progress has been made, Hawking and Penrose stress that physicists still have further to go in their quest for a quantum theory of gravity. The authors outline how their positions have further diverged on a number of key issues, including the spatial geometry of the universe, inflationary versus cyclic theories of the cosmos, and the black-hole information-loss paradox. ![]() But was he right? 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 into a single quantum theory of gravity? Can quantum and cosmos ever be combined? In The Nature of Space and Time, two of the world’s most famous physicists-Stephen Hawking ( A Brief History of Time) and Roger Penrose ( The Road to Reality)-debate these questions. From two of the world's great physicists- Stephen Hawking and Nobel laureate Roger Penrose- a lively debate about the nature of space and timeĮinstein said that the most incomprehensible thing about the universe is that it is comprehensible.
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