Scientists studying data from NASA’s Cassini spacecraft have discovered what they thought is the origin for one of the more unusual rings surrounding the planet Saturn. In a paper published in the journal „Science“, they said Saturn’s G ring is likely linked to an arc of relatively large ice particles in a part of the ring’s inner edge, which are kept in line by the gravitational influence of Saturn’s moon Mimas. Collisions with micrometeoroids create smaller particles, which are then spread throughout the ring by plasma in Saturn’s magnetic field.
https://solarsystem.nasa.gov/news/12393/cassini-finds-possible-origin-of-one-of-saturns-rings/