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The strength of the sun's gravitational field falls off as the square of the distance from the sun. The speed you need to stay in orbit is proportional to the force of attraction.

Thus the farther out a planet is, the slower it needs to go to stay in orbit.

Note: Mars is only 40% farther from the sun than we are, but it takes 2 whole years to go around the sun once. Its orbit is longer AND its velocity is lower.

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17y ago

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