St. Martin's Press  &  New York white mars. Copyright © 1999 by Brian W. Aldiss and Roger Penrose. All rights reserved. Printed in the United States of America. No part of this book may be used or reproduced in any manner whatsoever without written permission except in the case of brief quotations embodied in critical articles or reviews. For information, address St. Martin's Press, 175 Fifth Avenue, New York, N.Y. 10010.

Library of Congress Cataloging-in-Publication Data

Aldiss, Brian Wilson.

White Mars, or, The mind set free : a 21st century Utopia / Brian W. Aldiss in collaboration with Roger Penrose.-1st U.S. ed. p.  cm.

ISBN 0-312-25473-3

1. Twenty-first century-Fiction. 2. Mars (Planet)-Fiction. 3. Utopias-Fiction. I. Title: Mind set free. II. Penrose, Roger. III. Title.

PR6051.L3W47  2000

823'.914-dc21    99-462291

First published in Great Britain by Little, Brown and Company First U.S. Edition: April 2000

10  987654321