Here's why:

* Universal: Gravity acts on all objects with mass, from tiny particles to massive stars and galaxies.

* Always Attractive: Gravity only attracts, it never repels. This is unlike other forces like electromagnetism, which can both attract and repel.

* Long-Range: Gravity has an infinite range, meaning it can act over vast distances. This is why planets orbit stars and galaxies clump together.

* Weak but Powerful: While gravity is the weakest of the fundamental forces, it is the force that governs the large-scale structure of the universe.

While other forces like the strong and weak nuclear forces are stronger, they only operate at extremely short distances, within the nucleus of an atom. Gravity, on the other hand, shapes the universe on a massive scale.