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CONTENTS 1

Introduction 1

Rockets versus Aircraft 2

First Principles of Rocket Propulsion 4

Why It Works 6

Propellent Storage Tanks 8

Types of Propellent 10

The Propellent Pumps 12

Valves and Injectors 14

Combustion Chambers and Igniters 16

Cooling the Combustion Chamber 18

How a Rocket Motor Works 20

Different Kinds of Rockets 22

More Rockets 24

Ground Stations 26

Payload 28

The Force of Gravity 30

Escaping from the Earth 32

Principle of the Step-Rocket 34

Problems of the Step-Rocket 36

Into Orbit around the Earth 38

Movement in Space 40

Tracking Satellites 42

Messages from Space 44

The End of the Beginning 46

Vocabulary 48