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contentsPrologue 15in which the reader is reacquainted witha conversation imagined in a previous century,and the author's purpose is describedchapter OneIntimations of Spacetime 17in which we meet fanciful beings who inhabit thesurface of a plane, and their real butno less remarkable inventorchapter TwoEinstein's radical idea 00in which a famous scientist, after much effort, proposesan idea far superior to earlier conceptions; andseveral means to travel to the futureare illustratedchapter Three"Unphysical" Time Machines 00in which three time machines are imagined,and shown to be impossiblechapter FourPastward Time Travel...Seriously 00in which a scientist seeks advice for a work of fictionand inspires a new direction of studychapter fiveParadox 000in which a physicist, a philosopher, and an authorof fiction are found to agreechapter SixCosmic Strings and Chronology Protection 000in which one physicist proposes a new and ingenious mannerby which one might travel pastward, and anothercontends that nature forbids pastward travelby this or any means whatsoeverchapter SevenNovikov's Wild Ideas 000in which a physicist proposes a meansby whicha time machine might not be invented,but rather discoveredchapter EightA Time Travel Summit 000in which the discussion is continued inespecially agreeable surroundingschapter NineA Parade of Time Machines 000in which physicists imagine a varietyof time machineschapter TenTime Travel in Another Kind of Spacetime 000in which it is proposed that, if our universe is buta single branch of many, pastward travelneed engender no paradoxChapter ElevenExplaining the Apparent Absenceof Time Travelers 000in which the reader is invited to thinkin the manner of beings far morepowerful and wisechapter TwelveTime Machines at the Ends of Time 000in which physicists debate whether the universe will endin a cold and empty waste or a fiery implosion,and time machines are imagined to havea new and surprising useEpilogue 000Notes 000Glossary 000Bibliography 000Index 000
Library of Congress Subject Headings for this publication:
Space and time.
Time travel.
Physics.