"Every object of the universe attracts other object .the force of attraction between them is directly proportional to product of their masses and is inversely proportional to the square of distance between them.this force is along the line joining the centre of both the objects"
Mathematical form of Newtons Universal Law of Gravitation
F (gravitational force acting) = G*m1*m2/r^2
where G is the constant , m1 and m2 are masses of the two bodies and r is the distance between them. so from this we can assume that
G= F*r^2/m1*m2
Now as the mathematical form of law of gravitation remains same at any place in universe and we derive gravitational constant from that law, so it is also constant all over universe .
Henry Cavendish found the value of G which is 6.67*10^-11.
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