Large regions of Saturn's night side are illuminated by the planet's gleaming rings. Except for a sliver of the sunlit crescent at left, this view shows a part of the planet lit almost entirely by ringshine.
The shadow of the moon Mimas strikes the F ring at a different angle than the angle at which it is cast on the A ring, illustrating differences in the vertical heights of the rings in this image taken as Saturn approaches its August 2009 equinox.
From on high, the Cassini spacecraft spies a group of three ring moons in their travels around Saturn. Janus is seen at top, while Pandora hugs the outer edge of the narrow F ring. More difficult to spot is Pan, which is a mere speck in this view.
In this image from NASA's Voyager wide-angle image taken on Aug. 23 1989, the two main rings of Neptune can be clearly seen. In the lower part of the frame the originally announced ring arc, consisting of three distinct features, is visible.
With giant Saturn hanging in the blackness and sheltering Cassini from the sun's blinding glare, the spacecraft viewed the rings as never before, revealing previously unknown faint rings and even glimpsing its home world.
This image of Neptune was taken by NASA's Voyager 2's wide-angle camera; small trails of similar clouds trending east to west and large scale structure east of the Great Dark Spot all suggest that waves are present in the atmosphere and play a large role
This view of pale blue-green Uranus was recorded by NASA's Voyager 2 on Jan 25, 1986, as the spacecraft left the planet behind. The thin crescent of Uranus is seen here between the spacecraft, the planet and the Sun.
Dione's shadow is elongated as it is cast onto the round shape of Saturn in this image taken by NASA's Cassini spacecraft. The moon is not visible here. This view looks toward the northern, sunlit side of the rings from just above the ringplane.
NASA's Cassini spacecraft shows Saturn's shadow cutting sharply across its rings as the orbits of ring particles carry them suddenly from day to night. With no atmosphere to scatter light, shadows in space are much darker than we're used to here on Earth.
The Cassini spacecraft takes an angled view toward Saturn, showing the southern reaches of the planet with the rings on a dramatic diagonal. The moon Enceladus appears as a small, bright speck in the lower left of the image.
Although Mimas holds the unofficial designation of 'Death Star moon,' Tethys is seen here also vaguely resembling the space station from Star Wars. Apparently, Tethys doesn't want Mimas to have all the fun!
This image captured by NASA's Voyager 2 in 1986 revealed a continuous distribution of small particles throughout the Uranus ring system. This unique geometry, the highest phase angle at which Voyager imaged the rings, allowed us to see lanes of fine dust.