| Characteristics |
Planets |
| Thought to be a double planet, only outer planet with a rocky core, only planet discovered by an American | Pluto |
| Closest to the sun, no moons, 2nd smallest, may have shrunk, veiwed by Mariner 10 | Mercury |
| Great Red Spot, at least 28 moons, outer planet, veiwed by Voyager and Galileo | Jupiter |
| Spins on its side, blue, with faint rings | Uranus |
| Only planet with liquid water and life | Earth |
| Olympus Mons, red planet, several landers including: Mariners, Surveyor, Pathfinder, Voyager | Mars |
| Earth's "sister planet", greenhouse effect, veiwed by Venera and Magellan | Venus |
| Rings, gas giant, 30 moons, visted by Voyager | Saturn |
| 8th but sometimes 9th planet, methane atmosphere, blue green color, 8 moon (triton is one) named for a sea god | Neptune |
