Mars has two moons the size of Earth s Moon.
Why it is true
Mars has two very small moons, Phobos and Deimos, with diameters of only 22 and 12 kilometres, respectively. They are probably captured asteroids and have irregular shapes, unlike Earth s Moon.
Source: NASA
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.