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Why does every planet have a moon?

Originally posted by: HomeBrewerDude

Mars are captured asteroids.

So what is your point.
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as is pluto's moon, charon.

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If they were discovered today, both Pluto and Charon would be classified as Kupier Belt Objects (of which there are lots more), but Pluto is still referred to as a planet for historical reasons.
 
Most moons are assumed to have been formed out of the same collapsing region of protoplanetary disk that gave rise to its primary. However, there are many exceptions and variations to this standard model of moon formation that are known or theorized. Several moons are thought to be captured foreign objects, fragments of larger moons shattered by large impacts, or (in the case of Earth's Moon) a portion of the planet itself blasted into orbit by a large impact. As most moons are known only through a few distant observations through probes or telescopes, most theories about them are still uncertain.

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