Are Saturn's rings really disappearing?

The answer

Saturn's rings are indeed disappearing, shedding material onto the planet as 'ring rain' at a rate that would drain the entire ring system in roughly 300 million years. Research published in 2023 using data from NASA's Cassini mission (which orbited Saturn from 2004-2017) showed the rings may be surprisingly young - perhaps only 100-400 million years old, rather than forming with Saturn 4.5 billion years ago. Cassini's Grand Finale orbits measured the rings' mass at approximately 40% that of Saturn's moon Mimas, lower than expected for ancient rings. This means the rings existed neither during the dinosaur era nor during the earliest life on Earth. Ultraviolet observations reveal the rings are composed of over 95% pure water ice with minimal pollution from meteorite dust, further supporting a young age. Future observers millions of years hence will see a ring-free Saturn.