| Answer | Crossword Clue |
|---|---|
| MARINER | NASA explorer of Mars |
| WATER | NASA has found evidence of this on Mars |
| OPALS | NASA discovered them on Mars in 2008 |
| ORION | NASA spacecraft designed for travel to Mars |
| ROVER | Mars explorer |
| ROVER | Explorer on Mars |
| ROBOT | Mars explorer, e.g. |
