TAILIEUCHUNG - Space sciences VOLUME1 Space Business_2

Astronomers have studied the heavens for more than two millennia, but in the twentieth century, humankind ventured off planet Earth into the dark vacuum void of space, forever changing our perspective of our home planet and on our relationship to the universe in which we reside. Our explorations of space—the final frontier in our niche in this solar system—first with satellites, then robotic probes, and finally with humans, have given rise to an extensive space industry that has a major influence on the economy and on our lives. In 1998, . space exports (launch services, satellites, space-based communications services, and the like) totaled $64 billion. As we entered the. | space sciences . 3 VOLUME K-Z Humans in Space Pat Dasch Editor in Chief MACMILLAN REFERENCE USA THOMSON ----ỉệt-- GALE New York Detroit San Diego San Francisco Cleveland New Haven Conn. Waterville Maine London Munich EDITORIAL BOARD Editor in Chief Pat Dasch President RSC International Washington DC Advisory Editors Dr. Nadine G. Barlow Assistant Professor Northern Arizona University Flagstaff AZ Leonard David Senior Space Writer Boulder CO Frank Sietzen Jr. President Space Transportation Association Arlington VA EDITORIAL AND PRODUCTION STAFF Gloria Lam Project Editor Erin Bealmear Cindy Clendenon Alja Collar Stephen Cusack Kathleen J. Edgar Monica Hubbard Mark Mikula Kate Millson Brad Morgan Anna Nesbitt Angela Pilchak Amanda Quick Nicole Watkins Contributing Editors Michelle DiMercurio Senior Art Director Rita Wimberley Buyer Maria L. Franklin Permissions Manager Lori Hines Permissions Assistant Barbara J. Yarrow Manager Imaging and Multimedia Content Randy Bassett Imaging Supervisor Dan Newell Imaging Specialist Macmillan Reference USA Frank Menchaca Vice President Hélène G. Potter Editor-in-Chief Consulting Schools Swiftwater High School Swiftwater PA Teacher Howard Piltz Douglas Middle School Box Elder SD Teacher Kelly Lane North Dallas High School Dallas TX Teacher Norene Flaherty Rockdale High School Rockdale TX Teacher Vickie Caffey Medford Area Middle School Medford WI Teacher Jeanine Staab Copyright 2002 by Macmillan Reference USA an imprint of the Gale Group All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying recording or by any information storage and retrieval system without permission in writing from the Publisher. Macmillan Reference USA 300 Park Avenue South New York NY 10010 Gale Group 27500 Drake Rd. Farmington Hills MI 48331-3535 Library of Congress Cataloging-in-Publication Data Space sciences Pat Dasch editor in chief. p. cm. Includes .

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