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It varies: The planets closer to the Sun move faster (Kepler's Third Law). Mercury is fastest; according to Wikipedia, its average orbital speed is 47.87 km/s. Multiply that by 0.6 to get the approximate speed in miles per second.

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Q: What is the orbital speed of planets in miles per second?
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Related questions

What planets orbital speed is about 30 kilometers per second?

Mercury has an orbital speed of around 47.87 km/s, which is the closest to 30 km/s among the planets in our solar system.


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