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Because Mercury is so much more closer to the Sun than Pluto is. It appears that Mercury is moving faster because it's orbit around the sun is a lot smaller, they could both be moving at the same speed and it would still take Pluto a lot longer to complete it's orbit.

Compare to 2 runners running laps on two different tracks.

One track is one mile around, the other four miles around.

They both start at the same time and at the same speed, say four miles an hour.

While the runner on the four mile track has done one lap, the runner on the one mile track has done four laps, as is the same for Mercury and Pluto.

Because of the size of tracks and orbits it appears that one is moving faster than the other, but they have both covered the same distance at the same speed. Because of it's shorter "lap", Mercury will complete 1008.59 laps before Pluto completes it's first.

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15y ago
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12y ago

Mercury orbits the sun quicker than Neptune because Mercury is closer to the sun than Neptune. Mercury then doesn't have such a large circumference of the sun to orbit than Neptune. Mercury is the first planet in the solar system, and Neptune is 8th.

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10y ago

Because it is closest to the Sun.

Kepler (and later Newton's work) showed that planets orbit faster when they are nearer to the Sun

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12y ago

because it is smaller

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11y ago

It is in a higher orbit

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Q: Why does Mercury planet moves around the Sun faster than other planets?
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