Black Holes and Time Machines

An Abridged extract from 'Our Cosmic Habitat' by Martin Rees(C) Published by Princeton University Press and copyrighted, © 2002, by Princeton University Press. All rights reserved. No part of this book may be reproduced in any form by any electronic or mechanical means (including photocopying, recording, or information storage and retrieval) without permission in writing from the publisher, except for reading and browsing via the World Wide Web. Users are not permitted to mount this file on any network servers. By permission of Princeton University Press ($22.55/£15.95) Published in the UK by Weidenfeld and Nicolson (£14.99)

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Martin Rees is Royal Society Research Professor at Cambridge University, and holds the title Astronomer Royal of Great Britain. We have previously featured two articles by Martin - Are We Alone? and Recipe for the Universe.