| A | B |
|---|
| Four inner terrestial planets | Relatively small, dense, rocky surfaces |
| Mercury | Smallest and closest to the Sun |
| Venus | "Evening or morning star";atmosphere is mostly carbon dioxide |
| Earth | Water can exist here as a liquid |
| Mars | The "red" planet; surface composed of iron rich rocks |
| Asteroid belt | Beyond Mars, small rocky bodies orbiting the Sun |
| Gas giants | Four outer planets beyond the asteroid belt |
| Jupiter | Largest and most massive planet |
| Saturn | Best known for large and visible rings; has at least 30 moons |
| Uranus | Very cold; axis of rotation is greater than 90 degrees |
| Neptune | Bluish color comes from methane in the atmosphere |
| Pluto | No longer considered a planet by some; considered by some as the ninth and most distant planet from the Sun |
