978-1-4222-3418-1

Mason Crest 450 Parkway Drive, Suite D Broomall, PA 19008 www.masoncrest.com

© 2016 by Mason Crest, an imprint of National Highlights, Inc.

All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, taping, or any information storage and retrieval system, without permission from the publisher.

Printed and bound in the United States of America.

Series ISBN: 978-1-4222-3416-7 Hardback ISBN: 978-1-4222-3418-1 EBook ISBN: 978-1-4222-8479-7

First printing 1 3 5 7 9 8 6 4 2

Produced by Shoreline Publishing Group LLC Santa Barbara, California Editorial Director: James Buckley Jr. Designer: Tom Carling, Carling Design Inc. Production: Sandy Gordon www.shorelinepublishing.com

Library of Congress Cataloging-in-Publication Data is on file with the publisher.

Cover image: NASA