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Planetary Science
Planet Jupiter
The Moon

Why does Jupiter have moons?


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April 09, 2014 2:48AM

Mainly because of its mass. In general, the more massive a planet, the easier it is for such a planet to catch - or to keep - a moon. Thus, the four gas giants in our Solar System all have lots of moons; the smaller (and less massive) rocky planets have much fewer moons in comparison.