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Neptune is the farthest major planet from the Sun, at an average distance of 4.5 billion kilometers from the Sun, 30 times farther than the Earth. This makes its orbital path around the Sun more than 30 times as long as Earth's. So even at the same speed as Earth, it would take more than 30 Earth years to make one orbit. In fact, it is much moving much more slowly than Earth, less than 1/5 the speed, and takes 164.79 Earth years.

The basis for planetary orbits is that planets closer to the Sun, regardless of their mass, must move at a higher velocity than those farther out. Mercury's orbital speed is nearly 9 times as fast as Neptune's.

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15y ago

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Why does it take 164 Earth years for Neptune to revolve around the Sun and only takes Mercury 0.24 Earth years?

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