How does the required orbital velocity of a planet change based on its distance from the Sun?

Answer

Closer planets like Mercury must maintain a very high orbital velocity to counteract strong inward gravity.

Planets closer to the Sun experience a stronger gravitational pull, thus they must move at a proportionally higher orbital velocity to maintain the necessary balance and avoid spiraling inward.

How does the required orbital velocity of a planet change based on its distance from the Sun?

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