This material is provided as a public service to support the student Space Settlement Contest. The views expressed herein are not necessarily those of NASA or any other government body.

The material is presented in its original form with a few minor modifications.

• Three illustrations were not included since they were not relevant to the subject matter.
• In some instances the vocabulary was modified to be appropriate for students. Indicated by [verb deleted] or [sentence deleted].

A Coevolution Book

TABLE OF CONTENTS

Curator: Al Globus If you find any errors on this page contact Al Globus.

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