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.
Mars Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury. In English, Mars carries a name of the Roman god of war, and is often referred to as the "Red Planet"[14][15] because the reddish iron oxide prevalent on its surface gives it a reddish appearance that is distinctive among the astronomical bodies visible to the naked eye.[16] 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.