Try to imagine Saturn without its signature rings. Now picture two large icy moons shifting closer together little by little until — boom. Chaos. What was solid is now fluid. Diamantine shards scatter into the darkness. Many icy fragments tumble close to Saturn, remain there and dance around the gas giant in unison, ultimately forging the heavyweight body’s exquisite discs. This spectacular scene comes from an attempt to answer one of the greatest mysteries of the solar system: Where did Saturn’