Appulse is a term used to describe the effect of two celestial bodies coming into close proximity with each other. It is most commonly used in astronomy to describe the gravitational pull between two objects, such as planets or moons. This gravitational pull can cause changes in the orbits of the two objects, and can also cause tidal forces that can affect the tides on Earth. Appulse can also refer to the sudden brightening of a star due to the passing of another star in front of it. The term IMPACT is an appropriate description for this phenomenon, as it is the result of two objects having an effect on each other.