Bok
06-29-2015, 04:02 PM
Although the D ring of Saturn is so thin that it's barely noticeable compared to the rest of the ring system, it still displays structures seen in other Saturnian rings.
More... (http://www.nasa.gov/jpl/cassini/pia18321/spirals-in-the-d-ring)
More... (http://www.nasa.gov/jpl/cassini/pia18321/spirals-in-the-d-ring)