9 November: Starlight shining through Saturn's rings shows up subtle variations in the density of the particles there.

In this false colour image, spanning about 724 kilometres of Saturn's A ring, brighter areas show denser regions of the rings. Cassini's Ultraviolet Imaging Spectrometer used the flickering of light from the star Xi Ceti to work out the density of particles in the rings. The picture was taken when the spacecraft was about 6.8 million kilometres away from Saturn in July.

The bright bands in the left part of the picture are caused by the gravitational effects of Saturn's moon, Janus. The smaller moon Pandora is responsible for the patches in the right half of the rings.

Joshua Colwell, an astrophysicist at the University of Colorado, Boulder, presented the results at the American Astronomical Society's Planetary Sciences Meeting in Louisville, Kentucky, on 9 November.