Large Binocular Telescope Confirms Big Bang Helium Forecasts, Cutting Uncertainty to 0.5%
Updated
Updated · Eurasia Review · Sep 9
Large Binocular Telescope Confirms Big Bang Helium Forecasts, Cutting Uncertainty to 0.5%
2 articles · Updated · Eurasia Review · Sep 9
Summary
48 metal-poor galaxy samples let astronomers pin primordial helium abundance to roughly 0.5%, down from about 2%, in a new Large Binocular Telescope study.
Those helium measurements match long-standing Big Bang predictions and show the number of neutrino species present seconds after the universe began is consistent with the standard model of particle physics.
About 90% of cosmic helium formed in the Big Bang and the remaining 10% in stars over the past 13.5 billion years, making metal-poor galaxies a key test of the universe’s earliest chemistry.
The team combined optical and infrared helium signals with archival cosmic microwave background data, despite the rarity of suitable galaxies such as Leo P and distortions from Earth’s atmosphere.
Published in The Astrophysical Journal, the LBT Yp project plans to extend the method to more metal-poor galaxies, potentially using large survey archives including DESI.