Primordial Helium measured to most precise fraction to date
Artist rendition of Large Binocular Telescope measuring primordial helium
The Science Signal
https://thesciencesignal.com/universes-first-five-minutes-put-to-the-test-with-0-5-helium-precision/

An international team of physicists have refined the primordial measurement of helium in the universe to Yₚ = 0.2458 ± 0.0013. They were able to perform this calculation by analyzing 130+ hours of Large Binocular Telescope (LBT) observations on 15 remote galaxies. 

You can read more about the LBT YP project on The Astrophysical Journal

Categories:

The LBT Yp​ Project. V. Cosmological Implications of a New Determination of Primordial 4He

Tsung-Han Yeh (TRIUMF), Keith A. Olive (University of Minnesota), Brian D. Fields (Illinois U., Urbana), Erik Aver (Gonzaga U.), Richard W. Pogge (Ohio State U., Dept. Astron. and Chicago U., KICP) et al.

e-Print: 2601.22239 [astro-ph.CO]

DOI: 10.3847/1538-4357/ae879c Published in: Astrophys.J. 1008 (2026) 2, 241

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