Multiple choice general knowledge Which planet in our system is not named after a god? Mars Pluto Earth Venus Reveal answer Fill a bubble to check yourself C Correct answer Explanation Earth is the only planet in our solar system not named after a Roman deity. Mars, Venus, and Pluto (now a dwarf planet) are all named after Roman gods - Mars was the god of war, Venus the goddess of love, and Pluto the god of the underworld.