Introduction:
The gravitational force is a fundamental force of nature that exists between any two objects with mass. It is responsible for holding planets in their orbits around the sun, keeping moons in orbit around planets, and even attracting objects towards the Earth. The gravitational force between two bodies is always equal in magnitude but opposite in direction. This can be demonstrated through Newton's law of universal gravitation.

Newton's Law of Universal Gravitation:
- Newton's law of universal gravitation states that every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
- Mathematically, it can be expressed as F = G * (m1 * m2) / r^2, where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses of the two bodies, and r is the distance between their centers.

Equal in Magnitude:
- The magnitude of the gravitational force between two bodies is determined by the masses of the bodies and the distance between them.
- According to Newton's law of universal gravitation, the force is directly proportional to the product of the masses (m1 * m2).
- Therefore, if the masses of the two bodies are the same, the gravitational force between them will have the same magnitude.
- For example, the gravitational force between two equal masses will be twice as strong as the force between each mass and a third body.

Opposite in Direction:
- The direction of the gravitational force is always towards the center of the object with mass.
- According to Newton's law of universal gravitation, the force is inversely proportional to the square of the distance (r^2) between the centers of the two bodies.
- As the distance increases, the force decreases.
- Therefore, the direction of the gravitational force is always towards the center of the more massive body, regardless of the relative positions of the bodies.
- This means that the gravitational force between two bodies is opposite in direction, pulling each body towards the other.

Conclusion:
In conclusion, the gravitational force between bodies is equal in magnitude but opposite in direction. This can be explained by Newton's law of universal gravitation, which states that the force depends on the masses of the bodies and the distance between them. The equal magnitude of the gravitational force is determined by the product of the masses, while the opposite direction is determined by the attraction towards the center of the more massive body. This fundamental force plays a crucial role in shaping the structure and movement of objects in the universe.