Includes index.

What is a planet? -- How did the planets form? -- How do planets move? -- What planet orbits the sun the fastest? -- Why is Venus the solar system's hottest planet? -- How fast is Earth moving? -- Why don't you feel it? -- What's a moon? -- Why is Mars called the red planet? -- Is there life on Mars? -- Was there ever life on Mars? -- Are asteroids planets? -- What is the largest planet? -- How many moons orbit Jupiter? -- What are the rings of Saturn? -- Who discovered Uranus? -- What's the weather like on Neptune? -- what about Pluto? -- Are ther more dwarf planets? -- What's a Kuiper Belt Object? -- Are there planets circling other stars? -- Are there earthlike planets beyond our solar system? -- Meet the astronomer -- Glossary -- More to see and read -- Index.