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Two reasons basically. One, the inner planets are a lot closer and therefore accessible by even modest telescopes. We know that Mercury and Venus have no moons and Mars has two small ones. Beyond that optical telescopes on earth have a little trouble seeing something as small as a moon from that distance. Which brings us to reason two - spaceships.

The spacecraft we've sent to the systems of Jupiter and Saturn have discovered literally dozens of previously unknown moons. They were simply too small and too close to their primaries to show up on earth-bound telescopes. We've also gotten our first good looks at Saturn's rings and probably posed more questions than we answered.

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Q: Why has the number of known satellites for the inner planets remained almost constant while the number of known satellites for outer planets has increased during the past 400 years?
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