First discovered by Galileo in 1610, Saturn’s rings have long fascinated scientists. Ring formation and evolution offer tantalizing clues to planetary formation processes. The first few million years after the formation of our solar system 4.57 billion years ago were tumultuous, with collisions between planetesimals becoming common. Astronomers previously assumed that Saturn’s rings came from this early period, which was supported by their orbits and predominantly water-ice processes. However, understanding of orbital mechanics and particle collisions showed that the ring material should be constantly