Every particle of matter in the universe attracts every other particle with a force that is:

* Proportional to the product of their masses: The more massive the objects, the stronger the gravitational force between them.

* Inversely proportional to the square of the distance between their centers: The farther apart the objects are, the weaker the gravitational force.

This can be represented mathematically as:

F = G * (m1 * m2) / r^2

Where:

* F is the force of gravity

* G is the gravitational constant (approximately 6.674 x 10^-11 N m^2/kg^2)

* m1 and m2 are the masses of the two objects

* r is the distance between the centers of the two objects

In simpler terms:

Imagine two bowling balls. The heavier the bowling balls, the stronger the gravitational force between them. The farther apart they are, the weaker the force. This force is what keeps us grounded on Earth, what causes the planets to orbit the Sun, and what governs the movement of galaxies.