The Universal Law of Gravitation states that the module of the force, $F$ is $$F = \frac{GmM}{r^2},$$
where $m$ and $M$ are the mass of the two objects and $r$ is the distance between the two objects. From this, it is also derived that the gravitational potential energy is equal to $$ E = -\frac{GmM}{r}$$
So does this mean that when the two objects are together, i.e. $r=0$, the force and the gravitational energy is infinite? How is it possible that energy and force be infinite?
Please can you explain my doubt?