Deimos is the smallest moon of Mars with a diameter of only 12.6 km
phobos
It is Mars' smallest moon
Deimos, the smaller of the two moons of Mars, is the smallest moon in the solar system to orbit a terrestrial planet. It is irregular in shape but averages about 12 kilometers or about 9 miles across.
The smaller and more distant a moon is, the harder it is to detect. The smallest moon so far discovered is Aegaeon, a moon of Saturn with a diameter of around half a kilometre.
Moon, Mercury, Mars, Venus, Earth
Pluto's moon Nix is thought to smaller than the other small moon Hydra, but the two are very close in size. There is a large margin of error possible, with the two moons ranging from 50 to 150 km in diameter.
Venus and Mercury have the least moons in our solar system with none at all!
The order of Mercury ,Venus and Mars by size is: Mercury ,Mars and Venus
Nebula, The solar system, The sun, Jupiter, Earth, Mars, The moon, Pluto, Neutron Star
Neither. Mars is the second smallest planet in the solar system. Mercury is the smallest. Jupiter is the largest.
From largest to smallest: Nebula, Solar System, Sun, Jupiter, Earth, Mars, Moon, Pluto, neutron star.
Mars is a planet the Moon is not. Mars orbits the Sun-the Moon does not.