| A | B |
|---|
| Mercury | Closest to the sun; no atmosphere |
| Venus | Similar to Earth in size & mass; no moons |
| Earth | Atmosphere protects life; has one large moon |
| Mars | Has a thin atmosphere mostly carbon dioxide; 2 small moons |
| Jupiter | Largest planet; has 4 large moons & 59 smaller moons |
| Saturn | Atmosphere mostly hydrogen & helium; has complex ring system; 47 moons |
| Uranus | Large, gaseous planet with thin, dark rings; 27 moons |
| Neptune | methane atmosphere causes its bluish-green color; 13 moons |
