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Mars' moon are named Phobos and Deimos. The semimajor axes of their orbits are about 9400 km and 23500 km respectively. This is much closer to Mars than the Moon is to Earth, but the Moon is much, much larger, and from the surface of Mars its moons would appear very small... Phobos might appear as large as 1/3 the apparent size of the Moon from Earth, but Deimos would be a tiny speck, difficult to distinguish from a star. Both Phobos and Deimos are believed to be captured asteroids.

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14y ago

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