"Time travel in Newton's universe was inconceivable, but in Einstein's universe it has become a possibility. J. Richard Gott III, a Princeton astrophysicist who is a leading researcher in the field, gives readers a guided tour of the potential of traveling through time. Joining scientists such as Stephen Hawking and Kip Thorne who have previously considered the topic, the delightfully refreshing yet scrupulously careful Gott charts new territory in exploring this exciting idea."--BOOK JACKET.