Scientists Locate Universe's Missing Ordinary Matter Around Galaxies

For generations, cosmologists have carried a quiet unease: the universe, by their best calculations, contained far more ordinary matter than they could account for. Now, through the patient work of the CHIME radio telescope collaboration, that missing half has been found — not lost, but hidden in vast, gossamer halos of gas enveloping galaxies, invisible to optical eyes yet legible to radio waves. The discovery does not merely close a ledger; it expands our portrait of what a galaxy truly is, and reminds us that the cosmos conceals its most essential features in plain, if imperceptible, sight.