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Newton's law of universal gravitation states that every object in this universe attracts every other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between their centres. This is a general physical law derived from empirical observations by what Newton called induction.[1] It is a part of classical mechanics and was formulated in Newton's work Philosophiae Naturalis Principia Mathematica (the Principia), first published on 5 July 1687.Assuming SI units, F is measured in newtons (N), m1 and m2 in kilograms (kg), r in meters (m), and the constant G is approximately equal to 6.673×10\−11 N m2 kg\−2. The value of the constant G was first accurately determined from the results of the Cavendish experiment conducted by the British scientist Henry Cavendish in 1798, although Cavendish did not himself calculate a numerical value for G[3]. This experiment was also the first test of Newton's theory of gravitation between masses in the laboratory.