Which of the following is true about the universal gravitation constant?

The gravitational force between the two objects is given by:

$\mathrm{F}=\frac{\mathrm{GMm}}{{\mathrm{r}}^2}$
Where M and m are the masses of the objects and r is the distance between them.
G is the universal gravitational constant which has the value of 6.67X 10^-11 Nm²/kg². It is constant irrespective of the system or the masses and distance involved. It does not change its value from place to place and is constant universally.