CONTENTS What Is a Planet Types of Planets Formation of Planets Evolution of Planets Orbits of Planets I2 14 16 Rotations of Planets 18 Days Years and Seasons The Inner Planets The Outer Planets 20 22 Other Planets 26 28 A Sky Full of Planets Glossary For More Information 30 31 Index 32
WHAT IS A PLANET The word planet comes from the Greek word planetes which means wanderer Planets are large natural objects that orbit or travel around stars Eight planets orbit the star called the Sun In order from the closest to Sun 865 000 mi 1 392 000 km Jupiter 89 000 mi 143 000 km Saturn 74 900 mi 120 600 km Neptune 31 000 mi 50 000 km Venus Mars 7 500 mi 4 200 mi 12 100 km 6 800 km 3 Mercury Earth 3 000 mi7 940 mi 4 900 km 12 780 km Uranus 32 000 mi 51 000 km Sizes given are the approximate diameter of each body A The eight planets in the solar system have very different
What Is a Planet?
Even readers who think they know everything about planets will find much to intrigue, excite, and thrill them here.
About This Book
By: Jeff Mapua
Illustrated by:
Published by: Rosen Publishing provided by Britannica
