Published in 2018 by Britannica Educational Publishing a trademark of Encyclopædia Britannica Inc in association with The Rosen Publishing Group Inc 29 East 21st Street New York NY 10010 Copyright 2018 The Rosen Publishing Group Inc and Encyclopædia Britannica Inc Encyclopædia Britannica Britannica and the Thistle logo are registered trademarks of Encyclopædia Britannica Inc All rights reserved Distributed exclusively by Rosen Publishing To see additional Britannica Educational Publishing titles go to rosenpublishing com First Edition Britannica Educational Publishing J E Luebering Executive Director Core Editorial Mary Rose McCudden Editor Britannica Student Encyclopedia Rosen Publishing Amelie von Zumbusch Editor Nelson Sá Art Director Nicole Russo-Duca Designer Cindy Reiman Photography Manager Karen Huang Photo Researcher Library of Congress Cataloging-in-Publication Data Names Chesborough E D author Title What is light energy E D Chesborough Description First edition New York NY Britannica Educational Publishing in association with Rosen Educational Services 2018 Series Let’s find out Forms of energy Includes bibliographical references and index Audience 1-4 Identifiers LCCN 2016058553 ISBN 9781680487084 eBook Subjects LCSH Light Juvenile literature Classification LCC QC360 C53 2018 DDC 535 dc23 LC record available at https lccn loc gov 2016058553 Photo credits Cover p 1 Smileus Shutterstock com p 4 Alena Ozerova Shutterstock com p 5 Paper Cat Shutterstock com p 6 oliveromg Shutterstock com p 7 hxdbzxy Shutterstock com p 8 Rebroad p 9 Anita P Peppers Fotolia p 10 Roxana Bashyrova Shutterstock com p 11 Steve Mann Shutterstock com pp 12 16 20 24 Encyclopædia Britannica Inc p 13 Polonez Shutterstock com p 14 John and Penny Shutterstock com p 15 Merriam-Webster Inc p 17 Samantha Roche Fotolia p 18 Imagentle Shutterstock com p 19 NASA p 21 Mark Herreid Shutterstock com p 22 Mike Harrington Digital Vision Getty Images p 23 Copy right 1971 Z Leszczynski Animals Animals p 25 Bokeh Blur Background Subject Shutterstock com p 26 Matthew Bowden Fotolia p 27 Vibe Images Fotolia p 28 Nalle_och_SFO E Getty Images p 29 Michael Photo Shutterstock com interior pages background image wenani Shutterstock com
Contents Everything Light Touches Forms of Energy Sources of Light Properties of Light Understanding Radiation Light and Color Prisms and Rainbows Light and Sight How Much Light Gets Through Animals and Visible Light Light and Plants What Is Solar Energy Using Solar Energy Glossary For More Information Index 4 6 8 10 12 14 16 18 20 22 24 26 28 30 31 32
everything Light touChes People and other animals need light in order to see Look around you Everything you see is illuminated by a source of light Light is a form of energy Living things need energy to move work and grow Vocabulary When things are illuminated light is shining on them During the day most of our light comes from the sun Without the energy from To reach Earth light from the sun travels about 93 million miles 150 million kilometers 4
Today people use electricity to produce light At night cities like New York glow with electric light the sun there would be no plants or animals on Earth’s surface Before humans learned to harness light on their own nearly all light energy found on Earth came from the sun Eventually humans learned to build fires and then to use electricity This ability to control our environment was a huge step forward for humankind Energy fuels our universe from the stars in the sky to the tiniest algae in the sea Light energy that began its journey out in space allows us to grow our food light our homes and do much more 5
