Chapter The Moon

Distinctive Features 138 Mascons 139

Principal Characteristics of the Earth-Moon System 139 Properties of the Moon and the Earth-Moon System 140 Motions of the Moon 144 The Atmosphere 145 The Lunar Surface 145 Effects of Impacts and Volcanism 147 Small-Scale Features 150 Notable Surface Features 151 Lunar Rocks and Soil 154 Main Groupings 156 The Lunar Interior 157 Structure and Composition 157 Internal Activity of the Past and Present 158 Origin and Evolution 158 Lunar Exploration 160 Early Studies 160

History of Lunar Observation and Exploration 161 Exploration by Spacecraft 163 First Robotic Missions 163 Apollo to the Present 164 Lunar Resources 169

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