Which planet takes the least time to complete one revolution around the sun? Why?

The least time would have to be the one closest to the Sun, Mercury.

The closest planet would be traveling the fastest because it needs more speed tangent to it’s orbital path to balance inward gravitational force (acting proportionally to the inverse square of the distance from centers of gravity). It also would have the least distance to travel to go full circle.

Unless a profound incident occurs in the cosmos this will be the case for most orbit-related comparisons of frequency.

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