Cosmic Census Finds Hidden Ordinary Matter Beyond Galaxy Halos
TL;DR Summary
Astronomers used fast radio bursts to measure the density of ordinary matter in the universe and found most of it lies outside galaxy halos in the diffuse intergalactic medium, solving the long-standing missing-baryons puzzle and aiding precision cosmology for future telescopes like Roman and Euclid.
- A large amount of the Universe is missing. Scientists think they may have found it BBC Sky at Night Magazine
- Most of every galaxy is made of matter nobody has ever seen, detected, or explained — and the clearest early proof came from an astronomer named Vera Rubin, who simply measured how fast the outer stars of galaxies were spinning Space Daily
- If dark matter is everywhere, why do some galaxies seem to contain none at all? BBC Sky at Night Magazine
- Vera Rubin watched stars at the edges of galaxies moving far faster than visible matter could explain and found one of the clearest early signs that most of the universe is made of something we cannot see Space Daily
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