Why Isn't Pluto a Planet?: A Book about Planets »

What Is a Planet?     4
What Are the Eight Planets Like?     7
Why Isn't Pluto a Planet?     11
How Big Is the Solar System?     12
Do Planets Have Years Like We Do on Earth?     15
How Long Is a Day on Mars?     16
Are There Any More Planets?     19
Can You Believe It?     20
What Do You Think?     21
Glossary     22
Read More     23
Internet Sites     23
Index     24