Gravity and Solar system - English

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Explain the interface of Gravity and orbits and My solar system simulations. Relation between Sun, Earth, Moon and Space station. Determine the Earth Days. Define centripetal force and gravitational force. How gravity controls the motion of our solar system. Study universal law of gravitation. Determine the gravitational force between sun and earth. Effect of distance on planet's orbit and on earth days. Effect of mass and distance on gravitational force. Explain the movement of comet around the sun.