The largest moon of Mars is Phobos. Phobos is made up of a mixture of rock and water ice, and it has a heavily cratered surface.
A planet is a celestial body that orbits around a star and is not a satellite of another planet. It is typically large enough to be spherical due to its own gravity, and it has cleared its orbit of smaller objects. There are eight known planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Phobos is the larger and innermost of the two natural satellites of Mars, the other being Deimos. It was discovered by American astronomer Asaph Hall in 1877. Phobos orbits very close to the surface of Mars and has a diameter of about 22 kilometers. It is thought to be a captured asteroid that was brought into Mars' orbit by the planet's gravity.
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