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  • Planet Nine, n.

    The Guardian, 20 January 2016:

    If the researchers have their sums right, the mysterious new world is 10 times more massive than Earth and up to four times the size. Nicknamed Planet Nine, it moves on an extremely elongated orbit, and takes a staggering 10,000 to 20,000 years to swing once around the sun.

    February 2, 2016