We think Saturn's rings formed when a moon around the size of Mimas was shredded by tidal forces from its parent planet. By contrast, the rings on the other giant planets likely formed from the collision of small moons and asteroid impacts on the remaining ones.
Triton, Neptune's biggest moon is slowly spiraling inward towards the planet due to tidal deceleration. Assuming it doesn't get ejected before then or impacts before Neptune's gravity can break it apart, it should become quite the ring system!
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