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1. Baryonic Matter Density

   Linked via "total mass"

   Historical Context and Future Prospects
   Early estimates of $\Omegab$ in the 1980s, based solely on galactic rotation curves (which measured total mass), incorrectly assumed that all matter was baryonic, leading to density estimates up to $\OmegaM$ (total matter density) $\approx 1.0$. The discovery of the non-baryonic nature of the vast majority of cosmic mass was consolidated through Type Ia supernova observations and CMB…