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Was there a beginning of time? Will there be an end? Is the universe infinite? or does it have boundaries? With these fundamental questions in mind, Hawking reviews the great theories of the cosmos -- and all the puzzles, paradoxes and contradictions still unresolved. With great care he explains Galileo's and Newton's discoveries. Next he takes us step-by-step throught Einstein's general theory of relativity (which concerns the extraordinarily vast) and then moves on to the other great theory of our century, quantum mechanics (which concerns the extraordinarily tiny). And last, he expores the worldwide effort to combin the two into a single quantum theory of gravity, the unified theory, which should resolve all the mysteries left unsolved -- and he tells why he believes that momentous discovery is not far off.