| AREO | Of Mars |
| MARTIAN | Of Mars |
| REDPLANET | Nickname of Mars, so called because of the high levels of iron oxide found on its surface (3,6) |
| DEIMOS | Smallest and outermost of the two moons of Mars, named after a son of 29 (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) |
| ELONMUSK | Proponent of colonization of Mars |
| CRATERS | Much of the surface of Mars |
| EROS | Greek god of love, or an asteroid in the orbit of Mars |
| AMBROSIA | Answer brothers in middle of the road with third tray of Mars bars presumably (8) |
| ICECAPS | Feature of Mars clearly visible at end of robotic space relay (7) |
| PHOBOS | Along with Deimos, one of the two moons of Mars (6) |
| ROVER | Type of vehicle which explores the surface of Mars and the moon. (5) |
| EDEN | "This earth of majesty, this seat of Mars, / This other ___, demi-paradise": "Richard II" |
| ASTEROID | Any one of the celestial bodies between the orbits of Mars and Jupiter that were once designated symbols like the planets (8) |
