| Answer | Crossword Clue |
|---|---|
| PIOER | NASA planetary probe |
| UNMANNEDSPACECRAFT | Patriot's planetary probe |
| PIONEER | Unmanned planetary probe |
| PIONEER | NASA probe |
| MARINER | NASA space probe |
| MARINER | Early NASA probe |
| MARS | Subject of NASA probe. |
| GALILEO | NASA probe launched in 1989 |
| EROS | Asteroid on which a NASA probe landed in 2001 |
