| Answer | Crossword Clue |
|---|---|
| CHARON | Largest moon of Pluto |
| STYX | Moon of Pluto |
| CHARON | Moon of Pluto |
| STYX | Moon of Pluto discovered in 2012 |
| CHARONCARPENTER | House-builder on a moon of Pluto? |
| TITAN | Largest moon of Saturn |
| TITANIA | Largest moon of Uranus |
| GANYMEDE | Largest moon of Jupiter |
| TRITON | Largest moon of Neptune |
| OBERON | Second-largest moon of Uranus |
| IAPETUS | Third-largest moon of Saturn |
| RHEA | Second-largest moon of Saturn |
| ARIEL | Fourth-largest moon of Uranus |
