5 June 2014

Phobos is the larger and closer of the two natural satellites of Mars. Both moons were discovered in 1877.

A small, irregularly shaped object with a mean radius of 11 km, Phobos is seven times more massive than Mars’s outer moon, Deimos. Phobos is named after the Greek god Phobos, a son of Ares (Mars) and Aphrodite (Venus) which was the personification of Horror. The name “Phobos” is pronounced /ˈfoʊbəs/ foh-bəs, or like the Greek Φόβος.