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As planets are found in orbits further out from the Sun, these will take longer to complete an orbit - basically they have further to travel to complete an orbit. However to stay in orbit they do not have to travel as fast (to stay in orbit) as planets closer to the Sun. This is because the force of gravity falls of with the square of the distance the two bodies are apart.

The Suns outermost planet is Neptune (Pluto is no longer a planet) and it takes 164 Earth years to orbit the Sun!

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10y ago

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