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Moon is a satellite of earth. It moves round the earth. It has a quarter diameter of earth and 1/8 mass of earth. Its synodic period is 29 day 12 hour 43.1 minute. Its average orbital speed is 1.022km/s. 
he Moon is Earth's only natural satellite[nb 4][6] and the fifth largest satellite in the Solar System. It is the largest natural satellite in the Solar System relative to the size of its planet, a quarter the diameter of Earth and 1/81 its mass, and is the second densest satellite after Io. It is in synchronous rotation with Earth, always showing the same face; the near side is marked with dark volcanic maria among the bright ancient crustal highlands and prominent impact craters.Related
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