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G means the gravitational constant between earth and any celestial object.( body at space).its value is 6.673*10^-11 Nm^2/kg^2.it does not change.
g means acceleration due to gravity the force between earth and any terrestrial object ( body on the surface of the earth ).its value is 9.8 m/s^2.it changes
                                                           hope this will help u
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G is the universal gravitational constant. It doesn't change for planets or sun or moon. It is always constant and its value is 6.67×10⁻¹¹ Nm²/kg².

g is the acceleration due to gravity of earth. Value of g is 9.8 m/s
² on the surface of earth. Its value changes as we go up or go down from surface of earth.
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