The planet's orbital speed is higher when the planet is nearest to the sun.
The planet's orbital speed increases when it is nearest to the sun because of the strong gravitational force of the sun. A planet's orbital speed depends on the distance from the sun. The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves.
The farther it is from the Sun, the weaker the Sun's gravitational pull on the planet so it moves slower in its orbit around the sun so we can conclude that the planet's orbital speed is higher when the planet is nearest to the sun.
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