The crossword solutions for the term 'MARS OR VENUS' are ORB and PLANET. ORB is a 3 letter word which refers to a celestial body that orbits around a star or PLANET, such as a moon or asteroid. PLANET is a 6 letter word which refers to a large celestial body that orbits around a star and does not shine by its own light. Mars and Venus are two of the eight planets in our Solar System, and they are both orbited by moons.