Observational analysis reveals a conflict in Hubble constant values, suggesting issues in cosmological models.
There has been some hand-wringing of late about the tension between the value of the expansion rate of the universe – the famous Hubble constant, H0, measured directly from observed redshifts and distances, and that obtained by multi-parameter fits to the cosmic microwave background.
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Stacy McGaugh (2017) studied this question.
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