Dark spokes

Dark spokes

. Several dark spoke features streak across the central third of Saturnís B ring. They sweep around Saturn with a uniform velocity in apparent defiance of Keplerís laws. Electromagnetic forces probably levitate the dark, electrically charged particles above the main rings, permitting Saturnís magnetic field to carry them around the planet. This image was taken from the Voyager 2 spacecraft on 22 August 1981. (Courtesy of NASA and JPL.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University