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