Helium from the Universe’s first five minutes measured to 0.5% uncertainty
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An international team including University of Minnesota Twin Cities researchers used 130 hours on the Large Binocular Telescope to measure helium produced in the first five minutes after the Big Bang. They reported the result in five papers in The Astrophysical Journal, cutting uncertainty to 0.5%, about three times more precise than before, to sharpen tests of the Standard Model of physics.
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