As the size and distance between objects diminish, the universal law of gravitation becomes less applicable.

According to Newton's law of universal gravitation, two bodies in space pull on each other with a force proportional to their masses and the distance between them. This means that massive objects orbiting each other, such as the moon and Earth, exert substantial influence on one another.

Nuclear forces get stronger as the size and distance between things decrease and the law of gravitation cannot be applied.