May 2, 2016
These are the radio sounds of Saturn's rotation and the first sounds of Saturn from the Cassini mission. On approach to Saturn, data obtained by the Cassini spacecraft posed a puzzling question: How long is the day on Saturn? Cassini took readings that indicate a day on Saturn is 10 hours, 45 minutes, 45 seconds. But this is about six minutes longer than data recorded by Voyager 1 and Voyager 2, which flew by Saturn in 1980 and 1981. Scientists are looking for an explanation to how the rotation deep inside Saturn drives the radio pulse.