Existing theory predicts the radioactive decay of xenon 124 to have a half-life that surpasses the age of the universe “by many orders of magnitude,” but no evidence of the process had been found. New study finds the half-life to be close to 18 sextillion or 18,000,000,000,000,000,000,000 years.

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Existing theory predicts the radioactive decay of xenon 124 to have a half-life that surpasses the age of the universe “by many orders of magnitude,” but no evidence of the process had been found. New study finds the half-life to be close to 18 sextillion or 18,000,000,000,000,000,000,000 years.