We are at an interesting juncture in cosmology. Despite vast improvements in the measurement accuracy of the Hubble constant, a recent tension has arisen that is either signalling new physics or as-yet unrecognized uncertainties.
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Freedman, W. Cosmology at a crossroads. Nat Astron 1, 0121 (2017). https://doi.org/10.1038/s41550-017-0121
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DOI: https://doi.org/10.1038/s41550-017-0121
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