Astronomers measure Big Bang helium with unprecedented precision

· Science

An international team has measured the amount of helium formed in the first five minutes after the Big Bang with unprecedented precision, according to a report. The researchers used one of the world's most powerful telescopes to study 15 unusually pristine galaxies, whose undisturbed chemistry preserves a record of the primordial universe. Helium abundance is a key prediction of Big Bang nucleosynthesis, the process that set the initial mix of light elements, so a sharper measurement tests the standard cosmological model. The work is described as a major breakthrough in understanding the Universe's earliest moments.

Why it matters：Precision measurements of primordial elements are among the few direct tests of the standard cosmological model, so improvements constrain competing theories of the early universe.

Key points

  • The team studied 15 pristine galaxies with a powerful telescope.
  • The measurement targets helium produced in the first five minutes after the Big Bang.

Sources (original reporting)

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