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The Earth, itself, is the source for gravitational force. The hot, molten rock inside the core of the earth makes a magnetic field around it(the earth) which's force or pull that ensures all the objects of the earth are well stuck to it; a ball, if kicked, always come down to the ground only because of gravitational force. This is the gravitational force of the earth.
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The earth is the source and that discover was made by newton but the sun holds the earth and the rest of planets in the solar system with its gravity
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