phobos and demos are natural satellite of which planet
Phobos (moon) Phobos (/ˈfoʊbəs/ FOH-bəs or /ˈfoʊbɒs/ FOH-bos,[4] from the Greek Φόβος.) (systematic designation: Mars I) is the innermost and larger of the two natural satellites of Mars,[5] the other being Deimos. Both moons were discovered in 1877 by American astronomer Asaph Hall.