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Earth’s natural satellite, which has diameter of about 2,160 miles (3,475 kilometers) and an average distance from Earth of about 235,000 miles (384,000 kilometers), and orbits Earth in about 27.3 days. The force of the moon’s gravitational pull helps cause ocean tides. On the much less massive moon, a person would weigh only a sixth of his or her weight on Earth. The moon is covered with thousands of craters of all sizes, flat plains, mountains, and trenches. It has no air or water, and is very hot in the sunlight and very cold in the dark. Also, a natural satellite of any planet, such as any of Jupiter’s moons.