| Diameter | Planet | Answer | % Correct |
|---|---|---|---|
| 3,121 km | Jupiter | Europa | 95%
|
| 3,474 km | Earth | Moon | 95%
|
| 5,268 km | Jupiter | Ganymede | 93%
|
| 3,636 km | Jupiter | Io | 93%
|
| 5,151 km | Saturn | Titan | 93%
|
| 2,706 km | Neptune | Triton | 89%
|
| 4,816 km | Jupiter | Callisto | 80%
|
| 1,207 km | Pluto | Charon | 80%
|
| 1,577 km | Uranus | Titania | 77%
|
| 1,529 km | Saturn | Rhea | 66%
|
| 1,125 km | Saturn | Dione | 61%
|
| 1,522 km | Uranus | Oberon | 61%
|
| 1,157 km | Uranus | Ariel | 59%
|
| 1,469 km | Saturn | Iapetus | 59%
|
| 1,169 km | Uranus | Umbriel | 57%
|