Reviews and meta-analyses in peer-reviewed scientific journals

Saturn's Rings May Be 4.5 Billion Years Old, Cassini Probe Data Reveals

Dec 16, 2024, 05:31 PM

New research suggests that Saturn's rings could be much older than previously estimated, potentially as old as the planet itself, which formed around 4.5 billion years ago. Previous studies had indicated that the rings were relatively young, with an age estimate of between 100 and 400 million years, based on their remarkably clean appearance. However, a recent study published in Nature challenges this assumption by proposing that the rings' youthful appearance is due to their resistance to pollution from cosmic dust. The study, led by Ryuki Hyodo at the Institute of Space and Astronautical Science in Japan, suggests that high-speed impacts from micrometeoroids, as observed by NASA's Cassini probe, vaporize upon collision, creating charged nanoparticles and ions that are expelled from the rings or pulled into Saturn's atmosphere by its magnetic field, thus maintaining the rings' pristine condition. This new understanding could extend the estimated age of Saturn's rings by hundreds of millions to billions of years, aligning with the planet's age.