These periodic gravity perturbations are thought to compress the ring particles into clumps, while maintaining the ring’s well-defined outer edge.
Beyond the B-ring lies the Huygens gap, the widest dark void visible in this image, punctuated only by the bright Huygens ringlet. The 4800 km-wide Cassini Division separates the B-ring from the outermost A-ring, but itself is marked out with faint, concentric strands of ring material .... http://beforeitsnews.com
When seen from certain angles, Mimas closely resembles the Death Star, a fictional space station known from the film Star Wars . This is purely coincidental, as the first film was made nearly three years before the first close-up photographs of Mimas were taken. (Wikipedia)
