The force that objects exert on each other because of their masses is called gravity.

Here's a bit more about it:

* Newton's Law of Universal Gravitation: This law describes the force of gravity. It states that every particle 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.

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

* Examples:

* The force that keeps you on the Earth.

* The force that causes the Moon to orbit the Earth.

* The force that holds the planets in orbit around the Sun.

Let me know if you have any more questions about gravity!