Final answer:
Pluto's moon system is most likely the result of a collision with another celestial body, during the period of heavy bombardment, which caused material to coalesce into moons.
Step-by-step explanation:
Pluto's moon system is thought to have formed through a collision with another celestial body. This is similar to how our moon is believed to have formed, according to the giant-impact hypothesis. The early solar system was a place of chaos and intense geological activity, with frequent impacts from space debris.
This period, known as the heavy bombardment, left impact craters on celestial bodies. A large collision with Pluto could have ejected material into orbit around it, which eventually coalesced into its moons.
Unlike the gravitational capture theory, which has major drawbacks such as the need for a substantial loss of energy for capture to occur and typically results in highly eccentric orbits, the collisional formation is more consistent with the current orbits and characteristics of the moons.