The constant G depicted by capital letter G is called the universal gravitational constant and was determined by Cavendish to be G = 6.67 x 10^{−11} N m^{2}/kg^{2}capital G equal to 6.67 times 10 to -11 newtons times meters squared divided by kilograms squared. The word ‘universal’ indicates that scientists think that this constant applies to masses of any composition and that it is the same throughout the universe. The value of G is an incredibly small number, showing that the force of gravity is very weak.