The gravitational force exerted by Earth on the Sun is exactly the same as the gravitational force exerted by the Sun on Earth. This is due to Newton's Law of Universal Gravitation, which states that:

* Every particle of matter in the universe attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

This means that the force of gravity is a mutual attraction between two objects. While the Sun is much more massive than Earth, the force of gravity depends on both masses. Therefore, the force Earth exerts on the Sun is the same magnitude as the force the Sun exerts on Earth.

However, it's important to note that the effect of this force is very different on each object. The Sun is much more massive than Earth, so even though the force is the same, the Sun's acceleration due to Earth's gravity is much smaller than Earth's acceleration due to the Sun's gravity. This is why Earth orbits the Sun and not vice versa.