For decades, cosmologists knew the universe held more ordinary matter than telescopes could account for — a quiet discrepancy between what the Big Bang predicted and what human instruments could find. A 2025 study using 69 precisely located fast radio bursts has now placed most of that missing matter in the vast, nearly invisible gas between galaxies, offering the most detailed partition yet of where the universe's atoms actually reside. The finding suggests that galaxies, shaped by supernovae and black hole outflows over billions of years, expelled far more of their raw material into intergal