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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. THE NATIONAL ACADEMIES PRESS NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance. Support for this project was provided by Contract NASW 01001 between the National Academy of Sciences and the National Aeronautics and Space Administration. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsors. Cover: Hubble Space Telescope image of NGC 4414, a spiral galaxy 19.1 megaparsecs from our own. This image helped astronomers to determine more precisely the value of the Hubble constant, a measure of how fast the universe is expanding. Image courtesy of STScI/NASA. International Standard Book Number 0-309-09530-1 (Book) International Standard Book Number 0-309-54745-8 (PDF) Copies of this report are available free of charge from Space Studies Board National Research Council The Keck Center of the National Academies 500 Fifth Street, N.W. Washington, DC 20001 Additional copies of this report are available from the Copyright 2005 by the National Academy of Sciences. All rights reserved. Printed in the United States of America
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