Ring system
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A ring system is a disc or torus orbiting an astronomical object that is composed of numerous solid bodies such as dust particles, meteoroids, minor planets, moonlets, or stellar objects.
The ring orbiting Saturn consists mostly of chunks of ice and dust. The small dark spot on Saturn is the shadow from Saturn's moon Enceladus.
Artist's depiction of Haumea's ring system
A Galileo image of Jupiter's main ring.
A Cassini mosaic of Saturn's rings.
Neptune
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Neptune is the eighth and farthest known planet orbiting the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17
Galileo Galilei may have been the first person to sight Neptune
Urbain Le Verrier mostly successfully predicted Neptune's position
Johann Gottfried Galle was requested by Le Verrier to look for Neptune
John Couch Adams independently calculated Neptune's position