Moonlet discovered in Saturn's G ring


  • Randy Showstack


A half- kilometer-wide moonlet that NASA's Cassini spacecraft has found embedded within Saturn's G ring—one of the planet's outer, diffuse rings—could be a main source of that ring and its single ring arc, according to Cassini imaging scientists. “Before Cassini, the G ring was the only dusty ring that was not clearly associated with a known moon, which made it odd. The discovery of this moonlet, together with other Cassini data, should help us make sense of this previously mysterious ring,” said Matthew Hedman, a Cassini imaging team associate at Cornell University, in Ithaca, N.Y.