1. Mass of the objects: The more massive the objects, the stronger the gravitational force between them. This means that a larger object will exert a stronger pull on a smaller object.
2. Distance between the objects: The closer the objects are to each other, the stronger the gravitational force between them. As the distance increases, the force weakens rapidly.
Think of it like this: If you have two magnets, they will pull on each other more strongly when they are close together and when they are strong magnets.