system
Given the following post, respond as if you're commenting on Reddit:
human
Will the rings of Saturn eventually become a moon?

As best I understand it, the current theory of how Earth's moon formed involves a Mars sized body colliding with Earth, putting a ring of debris into orbit, but eventually these fragments coalesced to form the moon as we see it now. Will something similar happen to Saturn's rings? How long will it take.
gpt
No, they can't form a moon.

\[Geologist here, keeping the seat warm until an astronomer arrives\]

There is a distance from the centre of a planet called the Roche Limit inside of which objects can't accumulate to form moons.  

Very simply, a particle in a lower orbit (closer to the planet) feels a slightly greater gravitational pull from the planet than a particle further out - so there is a force pulling the pair apart. If this tidal force is greater than the gravitational pull between the two particles, they will separate from one another. 

The majority of Saturn's rings lie inside the planet's Roche Limit so they can only ever disperse. The two outer rings are outside of the limit so their origin is less certain.