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Satellites of Mars
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Phobos
Discovery year: 1877 Characteristics: Phobos is the larger and closer of the two moons of Mars, with a rapid orbital period that means it rises in the west and sets in the east of Mars, unlike most moons in the solar system. It is heavily cratered and has grooves on its surface. It is believed it may be a captured asteroid or a remnant from the planetary formation period.
Deimos
Discovery year: 1877 Characteristics: Deimos is the smaller and outer satellite of Mars. It has a smoother appearance compared to Phobos due to a layer of regolith, and it orbits Mars every 30.3 hours. Its features suggest it may share a common origin with Phobos, potentially being a captured asteroid.
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