Scientists Precisely Measure Early Universe Helium Abundance

An international team of scientists has achieved a significant advance in understanding the universe's initial moments by precisely measuring the amount of helium formed within the first five minutes after the Big Bang. Using a powerful telescope, researchers studied 15 pristine galaxies, acting as cosmic time capsules, to reduce the uncertainty in this fundamental measurement to just 0.5%. This three-fold improvement in precision offers crucial insights into the universe's earliest composition and evolution.