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The strength of the force is calculated from the mass of any two objects M1 and M2, and their distance D:

F = G.M1.M2 / D^2

Working in mks (metres-kilogram-second) units, this gives the force in Newtons between the Earth and Sun:

F = 6.670x10-11 * 5.976x1024 * 1.989x1030 / (1.496x1011)^2

which comes to 3.425x1022 Newtons.

This produces an acceleration of 5.93 mm/sec/sec towards the Sun which is just enough to make the the Earth curve by the right amount to the left all the time and keep it in its orbit.

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