Astronomers Precisely Measure Helium from Universe's First Five Minutes

An international team of astronomers has achieved a major breakthrough in precision cosmology by measuring the amount of helium formed in the first five minutes after the Big Bang with unprecedented accuracy. Using the Large Binocular Telescope to study 15 pristine galaxies, the research reduces uncertainty in this fundamental measurement to 0.5%, providing a powerful new tool for testing the Standard Model of physics.