Orbiting around Saturn, the Cassini probe captured this image of the planet -- which is gorgeous, but requires a little explanation. The rings themselves are visible here only as a slit, which seem, as they both share an axis, to pierce the planet's largest moon, Titan. But the rings become visible -- and show their recognizable stripes -- in shadows upon the surface of Saturn.
(Titan, by the way, only appears serene because it is swirling. A dense layer of clouds covers its entire upper atmosphere.)
Below, recent Pictures of the Day: