A moon is a large body or mass or material that orbits around a planet. It is usually much smaller than the planet. The Earth has only one moon, while Mars has two moons and Jupiter has 9 moons.
Our Moon is only about 1/4 the diameter of the Earth. Its gravity affects the Earth's tides. The Moon looks bright at night because of sunlight that is reflected off its surface. It has some distinct surface features that can be seen with the naked eye. Astronauts examined the surface more closely during Moon landings
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