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The earth gets its gravitational force from its core of nickel and iron ore. and also the gravitational force acts at the center of the earth
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Then What about magnetic field regarding forces surrounded it.
magnetic forces are different from gravitation. magnetic forces act to the poles

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Generally all planets have gravity but the gravitational pull of the earth is very much strong compared to other planets. According to sir Isaac Newton, every object in the universe attracts every other object with a force.even the sun exerts gravitational force on the planets to keep them in their orbit and even the planets exert an equal force on the sun but the origin of gravity still remains a mystery 
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