Jupiter has a lot more mass than either Mercury or
Venus, so you would expect it to collect more
moons for that reason. However, Earth is only
slightly more massive than Venus, and yet Earth
has a quite large moon, and similarly Pluto is
even less massive than Mercury, but also has
several moons. Part of it is probably just the
chance of where objects were in the solar system:
Earth's moon came about as the result of a
huge impact in the distant past. Pluto is in
the Kuiper belt, far enough from the sun
that all of the little comets haven't been swept
out of orbit by planets, so Pluto is able to
collect some. Why, then, does Mars have
moons? Probably chance.
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