|It is the smallest planet is and has no substantial atmosphere.
|Its atmosphere is about 78 percent nitrogen.
|A red iron oxide dust covers its surface.
|It appears vivid bright blue. Triton is its largest moon.
|William Herschel discovered it via a telescope in 1781.
|It is the largest planet. Ganymede is its largest moon.
|It has spectacular rings. Titan is its largest moon.
|It has a very dense, mostly carbon dioxide atmosphere.