Earth

Earth book cover — Long-distance Selfie 4 What Is Earth 6 How Did Earth Form 12 Where Is Earth Found 16 Why Do We Study Earth 18 Glossary 22 To Learn More 23 Index 24 Table of COntents

Earth — page 1 — It is February 14 1990 After 13 years of traveling Voyager 1 is 3 7 billion miles 6 billion kilometers from Earth The spacecraft turns toward Earth to take one last photo before its cameras shut down The photo shows bands of color on a dark background In one band Earth is a pale blue dot This long-distance selfie is one of the most famous photos in the world 4 4 Long dIstAnce SelfIe

Earth — page 2 — VOYAGER 1 LAUNCH FUN FACT A scientist named Carl Sagan had the idea to take the famous Voyager 1 photo He gave a popular speech in which he called Earth a pale blue dot People remember his words more than 20 years later 55 Voyager 1 pale blue dot photo World-Famous Words

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