Saturn’s rings are long thought to be between 100 million and 400 million years old based on more than a decade of observations by NASA’s Cassini spacecraft before its demise in 2017.

The idea that Saturn's rings are young seemed very strange in the context of the solar system's long evolutionary history."

The age of the rings that encircle Saturn is under dispute thanks to calculations that show they could have been formed billions – rather than millions – of years ago