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  • Neptune: The Planet That Hasn't Completed an Orbit in a Century
    The planet that has completed less than one revolution around the sun in the last 100 years is Neptune.

    Here's why:

    * Neptune's Orbital Period: Neptune takes approximately 165 Earth years to complete one orbit around the sun.

    * Time Since Last Revolution: Since Neptune's orbital period is much longer than 100 years, it has not finished a full revolution around the sun in the last century.

    Let me know if you have any other questions about the solar system!

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