Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, after Mercury. Named after the Roman god of war, it is often referred to as the "Red Planet" because the iron oxide prevalent on its surface gives it a reddish appearance. Mars is a terrestrial planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the valleys, deserts, and polar ice caps of Earth. Mars has two moons, Phobos and Deimos, which are small and irregularly shaped.
Ares "Mars" (Greek: Άρης) is the Greek god of war. He is one of the Twelve Olympians, and the son of Zeus and Hera. Phobos (Ancient Greek: Φόβος, meaning "fear") is the personification of fear in Greek mythology. He is the offspring of Aphrodite and Ares. Deimos (Ancient Greek: Δείμος, meaning "dread"), is the Greek god of terror.