| Answer | Crossword Clue |
|---|---|
| INTER | Planetary lead-in |
| APES | Planetary rulers in a 1968 movie |
| LAPLACE | French pioneer in planetary orbital theory |
| ORBITAL | Kind of velocity in planetary physics |
| METEOR | Planetary threat in some sci-fi films |
| NYE | C.E.O. of the Planetary Society starting in 2010 |
