See the Math Law of Universal Gravitation

Newton's law of universal gravitation is:

Here, F  is the attractive force that particle 1 with mass, m₁, exerts on particle 2 with mass, m₂, is the direction vector from particle 1 to particle 2, and G is the universal gravitational constant that has the same value for all particles. Measurements show that G has the value 6.67 x 10^-11 Nm²/kg². This equation also embodies Newton's third law of motion. By switching the labels of the particles, the force that particle 2 exerts on 1 is equal in magnitude but opposite in direction because only changes sign.

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