Here's why:

* Universal Force: Gravity is a fundamental force of nature that attracts any two objects with mass. This means it applies to everything from tiny particles to massive planets.

* Constant Presence: Gravity is always present, regardless of whether an object is moving or stationary.

* Influence on Motion: Gravity is the force that keeps us grounded, causes objects to fall, and dictates the orbits of planets around stars.

While there are other forces in the universe (like electromagnetic forces), gravity is the one that acts on all objects with mass.