The law of universal gravitation was released by Isaac Newton in 1686 and the myth says it was inspired by an apple falling from a tree. His statement is:
"Every body in the universe attracts the other with a force that is proportional to the product of their masses and inversely proportional to the square of the distance that separates"
F = G m1 * M2 / r2, where G is a gravitational constant, put there by Cavendish (English, 1731-1810) using a torsion balance. G = 6.67 x10 (-11) (Mm2/Kg2) in MKS
This value of G means that two masses of 1 Kg 1 m are attracted by the power of 6.67 x10 (-11) N. 
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