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The moon is the earth's only natural satellite ang the fifth largest planet in the solar system. The average distance from the earth to the moon is 3384403 kilomatres.The gravitational pull at its surface is about a sixth of the earth's.The moon makes a complete trip around the earth every 27.3 days,and the periodic changes in the geometry of the earth-moon-sun system are responsible for the moon phases that repeat every 29.5 days. The gravitational forces produced by the moving around of the moon and the earth around a common axis, are largely responsible for the tides on the earth. The moon is the only space body that humans have traveled to and landed on.the first spaceship to escape earth's gravity and pass near the moon was the Soviet Union's Luna 1, the first space ship to hit the moon surface was Luna 2,and the first photographs of the normal clear far side of the moon were made by Luna 3 ,all in 1959.The US Apollo program has achievedthe first manned spaceship to visit the moon, reasulting six landings between 1969 and 1972. Human exploration of the moon have announced plans to send either people or robotic spaceship to the moon.On 4 December 2006,NASA outlined plans for a base on the moon as preparation for a voyage to Mars.
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