Here's why:

* Universal Attraction: Gravity is a fundamental force that attracts any two objects with mass.

* Distance and Mass: The strength of gravity depends on the mass of the objects and the distance between them. Larger masses exert a stronger gravitational pull, and objects closer together experience a stronger force.

* Impact: Gravity is responsible for holding planets in orbit around stars, galaxies together, and even for the formation of stars and planets themselves.

While other forces exist (like electromagnetism, strong nuclear force, and weak nuclear force), gravity is the only force that acts over vast distances and affects all objects with mass.