| DEIMOS | Outer moon of Mars |
| PHOEBE | Small outer moon of Saturn; a Greek Titaness associated with the moon; or, the first name of the Friends character played by Lisa Kudrow (6) |
| PHOBOS | Moon of Mars named alter the Ancient Greek god of horror (6) |
| DAINTY | Smaller and outer of the two moons of Mars (6) |
| DEIMOSMONEY | Currency on a moon of Mars? |
| HALL | Asaph, U.S. astronomer who discovered the moons of Mars (4) |
| ARES | The moons of Mars are named after his sons |
| ROVER | Type of vehicle which explores the surface of Mars and the moon. (5) |
| REDPLANET | Nickname of Mars, so called because of the high levels of iron oxide found on its surface (3,6) |
| THEREDPLANET | Nickname of Mars because of the rusting of iron minerals in its soil (3,3,6) |
| CANEL | Any of a series of channel-like markings visible on the surface of Mars when viewing through a telescope (5) |
| ELON | First name of the founder of SpaceX, a private company set up to enable the colonisation of Mars (4) |
| OPAL | Present on the surface of Mars and thought by the Ancient Greeks to be a tear of Zeus, a gemstone of hydrated silica (4) |
| BELLONA | Roman goddess of war, sometimes identified as the wife or sister of Mars; counterpart of the Greek Enyo (7) |
| MARINER | Any of a series of US space probes launched between 1962 and 1971 that sent back photographs of Mars and Venus |
| ANTARES | Roughly meaning "rival of Mars", name of the brightest star or "heart" of the constellation Scorpius (7) |
| CRATERS | Much of the surface of Mars |
| ELONMUSK | Proponent of colonization of Mars |
| CELEBRATIONS | Tin of miniature versions of Mars chocolate bars |
| EROS | Greek god of love, or an asteroid in the orbit of Mars |
