... Spokes Reappear on Saturns Rings . ... Credit Copyright: Cassini Imaging Team , ISS , JPL , ESA , NASA Explanation: What causes the mysterious spokes in Saturn's rings? ... Oddly, the spokes more commonly observed when Saturn's rings are more nearly edge on to the Sun, and so were conspicuously absent from initial images sent back by the robot Cassini spacecraft now orbiting Saturn. ... Publications with keywords: Saturn rings . ... Cassini Spacecraft Crosses Saturns Ring Plane . ... Saturn at Night...