The gravitational force between two massive objects, such as spheres, attracts them toward each other. This attractive force is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. As a result, the gravitational force between two massive spheres pulls them closer together, leading to their mutual attraction and potential collision if they are in close proximity. This phenomenon is the fundamental basis of gravitational forces in celestial bodies, such as planets and stars, and plays a crucial role in shaping the structures and dynamics of the universe.