The universal law of gravitation states that;
Every particle attracts every other particle in the universe with a force that is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
For two objects of masses, m1and m2 and the distance between them r, the force (F) of attraction acting between them is given by the universal law of gravitation as:
Where G is the universal gravitation constant
The value of G is found to be G = 6.673 x 10-11 N m2/kg2.