| Rank | Diameter (km) | Hint | Answer | % Correct |
|---|---|---|---|---|
| 1st | 1,391,400 | The center of our Solar System. | Sun | 100%
|
| 6th | 12,742.0168 | The big blue marble. | Earth | 97%
|
| 2nd | 139,772 | The largest planet. | Jupiter | 97%
|
| 8th | 6,779 | The Red Planet. | Mars | 97%
|
| 14th | 3,474.8 | Visited by Apollo astronauts. | Moon | 97%
|
| 5th | 49,244 | The farthest planet. | Neptune | 97%
|
| 3rd | 116,464 | The ringed planet. | Saturn | 97%
|
| 4th | 50,724 | The sideways planet. | Uranus | 97%
|
| 7th | 12,103.6 | The hottest planet. | Venus | 97%
|
| 11th | 4,878.8 | The smallest planet. | Mercury | 91%
|
| 13th | 3,643.2 | The most volcanic world. | Io | 82%
|
| 15th | 3,121.6 | Hidden ocean under ice. | Europa | 79%
|
| 9th | 5,268.2 | The largest moon. | Ganymede | 74%
|
| 10th | 5,149.46 | Saturn’s biggest moon. | Titan | 74%
|
| 12th | 4,820.6 | Jupiter’s most cratered moon. | Callisto | 68%
|
| 16th | 2,706.8 | Neptune’s largest moon. | Triton | 65%
|