* Have greater mass. The more massive the objects, the stronger the gravitational force between them.

* Are closer together. The closer the objects are, the stronger the gravitational force.

Think of it like this:

* Mass: A big, heavy object (like a planet) has a stronger pull than a small, light object (like a pebble).

* Distance: You feel the Earth's gravity strongly when you're standing on its surface. As you move further away from Earth (like in a rocket), the pull of gravity weakens.

The exact relationship between mass, distance, and gravitational force is described by Newton's Law of Universal Gravitation.