| Answer | Crossword Clue |
|---|---|
| LER | Neptune, to Celts |
| EIRE | Ireland, to Celts |
| ERSE | Pertaining to the Celts. |
| ERSE | Pertaining to the Highland Celts. |
| MOON | Triton, to Neptune |
| SINKABLE | Vulnerable to Neptune. |
| SATELLITE | Triton, to Neptune |
| UNDERWATER | Where to find Neptune? |
| ODE | Phillis Wheatley's "... to Neptune" |
| LER | Neptune, to a Celt |
| DEI | Mars and Neptune, to Nero |
| DEI | Saturn and Neptune, to Cato |
| VOYAGER | First mission to visit Uranus and Neptune |
| VOYAGER | First spacecraft to reach Uranus and Neptune |
