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One year on Neptune lasts about 165 Earth years.

One year on Neptune lasts about 165 Earth years.

Neptune is so far from the Sun that it takes about 165 Earth years to travel around it just once. Since it was discovered in 1846, it has completed only one full orbit (finished in 2011).

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More facts about Planets

Mars has a volcano three times taller than Mount Everest. Mars has a volcano three times taller than Mount Everest. Scientists think it rains diamonds inside Neptune and Uranus. Scientists think it rains diamonds inside Neptune and Uranus. Mercury is the planet closest to the Sun. Mercury is the planet closest to the Sun. A day on Venus is longer than a whole year on Venus. A day on Venus is longer than a whole year on Venus. Mars is called the Red Planet because of its rusty dust. Mars is called the Red Planet because of its rusty dust.