CONTENTS Overview Star Light Star Bright Neighbors and Twins The Sun's Core IO The Sun's Surface 12 14 16 The Sun's Atmosphere The Sun and the Solar System How the Sun Warms Earth The Sun from Pole to Pole 18 20 The Sun and the Seasons 22 The Sun Through Human History 24 The Sun and the Moon 26 The Sun The Beginning and End 28 Glossary 30 For More Information 31 Index 32
OVERVIEW The Sun warms Earth and lights our days but what is a sun A sun is a star that is the center of a solar system All suns are stars but not all stars are suns because some stars exist without planets surrounding them A sun is a star that has planets surrounding it Our Sun is one of many in the universe 4
A star is a hot sphere of gases that gives off energy in the form of light and heat Our Sun is one of many stars in the universe Scientists have theorized that there are at least 10 billion galaxies in the universe In our galaxy alone the Milky Way there are about 200 billion stars THINK ABOUT IT MEANOR A Most solar systems have two or more Only a few thousand stars What would stars all from our own a sunrise be like galaxy are visible to the with two suns naked eye The Andromeda galaxy can also be seen but it appears like a single star
