Here's why:

* Strong Nuclear Force: This force binds protons and neutrons together within the nucleus of an atom. It is extremely strong at very short distances, but weakens rapidly with distance. It's responsible for holding the nucleus together, despite the repulsion between positively charged protons.

* Electromagnetic Force: This force governs the interaction between charged particles. It's responsible for phenomena like electricity, magnetism, and light. While weaker than the strong force, it has a longer range.

* Weak Nuclear Force: This force governs the radioactive decay of atomic nuclei. It's responsible for processes like beta decay and the fusion of hydrogen atoms in the sun. It's much weaker than the strong force and has a shorter range.

* Gravity: This force is the weakest of the four fundamental forces, but it's responsible for the attraction between any two objects with mass. It has an infinite range and is what holds planets in orbit around stars, and stars in galaxies.

In summary: While gravity might seem powerful on a large scale, the strong nuclear force is far stronger at the atomic level, holding the nucleus together against enormous electrostatic repulsion.