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Question

Where is the centre of mass of the Earth-moon system?


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Solution

  1. Gravitational force binds the moon and the earth together. The "pericenter" of the earth-moon system is the center of mass, and it is always close to the bigger body. This center is around 1068 miles (1719 kilometers) from the earth's surface.
  2. While it may seem that the moon rotates around the earth, in fact, both objects really revolve around a single center of mass. The earth's interior is where the earth's center of mass is located because it has a far larger mass than the moon. The earth-moon system's center of mass travels in an elliptical orbit around the sun

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