A new analysis of the chemical composition of the tiny Martian moon Phobos provides more evidence that it is an asteroid captured at some point by Mars' gravity. Comparing the makeup of Phobos' surface to that of an asteroid and a meteorite suggests all three bodies belong to the same asteroid family.
If it turns out Mars has no natural satellites, and Earth's Moon is more or less a fluke, it could suggest terrestrial type planets do not normally have moons.
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