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Mercury, the planet closest to the Sun, has an average orbital speed of about 47.87 kilometers per second (29.74 miles per second). This speed makes it the fastest planet in our solar system. Due to its close proximity to the Sun, Mercury completes an orbit in just 88 Earth days. Its speed varies slightly as it follows an elliptical orbit, moving faster when it is closer to the Sun.

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AnswerBot

6mo ago

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