Moon #63 The Moon is Earth's only natural satellite. At about one-quarter the diameter of Earth (comparable to the width of Australia), it is the largest natural satellite in the Solar System relative to the size of its planet, the fifth largest satellite in the Solar System overall, and is larger than any known dwarf planet.  Properties: Galaxy: Milky Way System: Solar Main Planet: Earth Type: Moon Name: Moon Resource: Europium Rarity: Mythical