上海天文台提出利用银河系失踪重子测量银河系总质量的新方法 - 2020年12月22日

Local scientists have found a novel method to weigh the Milky Way galaxy with its missing baryons.
Astronomical observations have provided strong evidence that baryons, known as normal matter, only account for about 6 percent of the total mass of the Milky Way, a galaxy dominated by dark matter. But the Big Bang Nucleosynthesis theory predicts roughly 16 percent of the baryons in the universe.
Where are the missing baryons? They may hide themselves in the galactic halo.