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despite its vastness, it only takes 39-40 digits of pi to calculate the size of the observable universe to an accuracy of 1 hydrogen atom. Because of this, NASA uses only 15 digits of pi in even their highest accuracy calculations.

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Fun Fact: despite its vastness, it only takes 39-40 digits of pi to calculate the size of the observable universe to an accuracy of 1 hydrogen atom. Because of this, NASA uses only 15 digits of pi in even their highest accuracy calculations.

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jpl.nasa.gov

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