For deep background, Michael S. Turner just published a nice review of the past 50 years of cosmology, from when the "errors were in the exponents" ;) The Road

For deep background, Michael S. Turner just published a nice review of the past 50 years of cosmology, from when the "errors were in the exponents" ;) The Road to Precision Cosmology https://arxiv.org/abs/2201.04741 https://arxiv.org/abs/2201.04741