| Authors' preface | p. xi |
| Acknowledgements | p. xiii |
| List of figures | p. xvii |
| List of tables | p. xxi |
| List of abbreviations and acronyms | p. xxiii |
| The scientific significance of planetary ring systems | p. 1 |
| "SMAISMRMILMEPOETALEUMIBUNENUGTTAUIRAS" | p. 1 |
| First impressions | p. 2 |
| Major characteristics shared by the known ring systems | p. 4 |
| Major differences between the known ring systems | p. 5 |
| What causes ring systems? | p. 7 |
| What rings tell us about the planet they circle | p. 9 |
| What rings tell us about the nearby moons | p. 11 |
| Rings as a natural laboratory for many-body interactions | p. 13 |
| Outline of the remainder of this book | p. 14 |
| Notes and references | p. 15 |
| Bibliography | p. 15 |
| Pictures and diagrams | p. 16 |
| The discovery of the Saturn ring system | p. 17 |
| First observations of Saturn's companions | p. 17 |
| A model for the ring emerges | p. 20 |
| The nature of the rings | p. 23 |
| Encounters with the rings | p. 27 |
| Notes and references | p. 32 |
| Bibliography | p. 33 |
| Pictures and diagrams | p. 33 |
| The discovery of the Uranus ring system | p. 35 |
| First observations of Uranus's ring | p. 35 |
| Observations prior to Voyager's Uranus encounter | p. 39 |
| Voyager 2's encounter with Uranus's rings | p. 41 |
| Post-Voyager observations of Uranus's rings | p. 45 |
| Notes and references | p. 46 |
| Bibliography | p. 48 |
| Pictures and diagrams | p. 48 |
| The discovery of the Jupiter ring system | p. 49 |
| First observations of Jupiter's ring | p. 49 |
| The second encounter with Jupiter's ring | p. 51 |
| Galileo encounter | p. 53 |
| Galileo ring observations | p. 54 |
| Notes and references | p. 57 |
| Bibliography | p. 58 |
| Pictures and diagrams | p. 59 |
| The discovery of the Neptune ring system | p. 61 |
| First observations of Neptune's ring | p. 61 |
| More stellar ring occultations | p. 62 |
| The Voyager 2 Neptune encounter | p. 63 |
| The rings of Neptune | p. 68 |
| Notes and references | p. 71 |
| Bibliography | p. 72 |
| Pictures and diagrams | p. 72 |
| Present knowledge of the Jupiter ring system | p. 73 |
| Introduction | p. 73 |
| Ring radial characteristics | p. 74 |
| Main ring | p. 74 |
| Gossamer rings | p. 76 |
| Halo ring | p. 77 |
| Ring-particle properties | p. 79 |
| Notes and references | p. 81 |
| Bibliography | p. 82 |
| Pictures and diagrams | p. 82 |
| Present knowledge of the Uranus ring system | p. 83 |
| Introduction | p. 83 |
| Ring dimensions, shapes, and inclinations | p. 84 |
| Physical properties of the ring particles | p. 87 |
| Ring-particle size distribution | p. 88 |
| Ring-particle composition | p. 89 |
| Ring-particle reflectivity | p. 90 |
| Ring interactions with satellites | p. 90 |
| Dust environment and possible magnetic field interactions | p. 92 |
| Notes and references | p. 93 |
| Bibliography | p. 93 |
| Pictures and diagrams | p. 94 |
| Present knowledge of the Neptune ring system | p. 95 |
| Introduction | p. 95 |
| Ring radial characteristics | p. 96 |
| Ring azimuthal variations | p. 99 |
| Small satellites near the rings | p. 100 |
| Possible electromagnetic effects | p. 101 |
| Physical properties of the rings | p. 102 |
| Notes and references | p. 103 |
| Bibliography | p. 104 |
| Pictures and diagrams | p. 104 |
| Pre-Cassini knowledge of the Saturn ring system | p. 105 |
| Introduction | p. 105 |
| Nomenclature and radial dimensions of the Saturnian rings | p. 106 |
| Vertical structure in Saturn's rings | p. 111 |
| Azimuthal non-uniformity in Saturn's rings | p. 114 |
| Gravitational interactions of Saturn's rings and satellites | p. 118 |
| Gaps and non-circular features in Saturn's rings | p. 122 |
| Rarified gases in the vicinity of Saturn's rings | p. 123 |
| Ring-particle properties | p. 124 |
| Reflective properties of Saturn's rings | p. 128 |
| Thermal properties of Saturn's rings | p. 129 |
| Earth-based observations of Saturn's rings since 1981 | p. 130 |
| Voyager radio occultation data and their interpretation | p. 132 |
| Interactions between Saturn's rings and magnetic field | p. 133 |
| Summary and major unanswered questions before Cassini | p. 135 |
| Cassini scientific objectives for Saturn ring observations | p. 138 |
| Notes and references | p. 139 |
| Bibliography | p. 146 |
| Pictures and diagrams | p. 146 |
| Early results about Saturn's rings from Cassini | p. 147 |
| Overview | p. 147 |
| Cassini spacecraft and mission | p. 149 |
| Main ring structure | p. 153 |
| Radial structure | p. 153 |
| Spiral density and bending waves | p. 154 |
| Main ring irregular structure | p. 160 |
| C ring and Cassini Division | p. 163 |
| Main ring azimuthal structure | p. 164 |
| Main ring vertical structure; ring volume density | p. 165 |
| Diffuse rings | p. 166 |
| Ring composition and particle properties | p. 170 |
| Ring composition | p. 170 |
| Ring-particle sizes | p. 171 |
| Rings in the thermal infrared | p. 174 |
| The ring atmosphere | p. 176 |
| Ringmoons and ringlets | p. 177 |
| The multi-stranded F ring | p. 177 |
| Embedded moonlets | p. 182 |
| Even smaller embedded chunks and shards | p. 184 |
| Evolutionary processes and time variations | p. 185 |
| Meteoroid bombardment | p. 185 |
| Yet another short timescale | p. 191 |
| Ring origin | p. 191 |
| Summary | p. 192 |
| Notes and references | p. 193 |
| Pictures and diagrams | p. 199 |
| Comparative planetology of the giant planet ring systems | p. 201 |
| Introduction | p. 201 |
| Ring dimensions | p. 201 |
| Ring azimuthal structure | p. 202 |
| Ring-particle characteristics | p. 202 |
| Gravitational interactions of rings with satellites | p. 205 |
| Electromagnetic interactions of rings with magnetic fields | p. 206 |
| Ring creation, evolution, and age | p. 207 |
| Unanswered questions | p. 209 |
| Notes and references | p. 211 |
| Bibliography | p. 212 |
| Pictures and diagrams | p. 212 |
| Anticipated future observations of planetary ring systems | p. 213 |
| Introduction | p. 213 |
| Future telescopic observations and theoretical studies | p. 214 |
| Earth-orbiting telescopic observations | p. 215 |
| Spacecraft missions to the giant planets | p. 217 |
| Notes and references | p. 218 |
| Bibliography | p. 219 |
| Pictures and diagrams | p. 219 |
| Glossary | p. 221 |
| Index | p. 227 |
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