Here's why:

* Gravity is a fundamental force: It's one of the four fundamental forces in the universe, along with electromagnetism, the weak force, and the strong force.

* Mass attracts mass: Gravity is the force of attraction between any two objects with mass.

* It acts over any distance: While the force weakens with distance, it technically never reaches zero.

The nuance:

While it's true that gravity acts between any two objects with mass, the force might be so incredibly weak at vast distances that it's effectively negligible. For example, the gravitational pull between you and a distant galaxy is so small it's impossible to measure.

In summary: Gravity acts between any two objects with mass, but the force might be too weak to notice over extremely large distances.