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Discrepancy in Universe's Expansion Rate Measurement

Two independent methods for measuring the universe's expansion rate (H0) disagree by 10% at 5-sigma significance. The discrepancy between 73.5 km/s/Mpc from the cosmic distance ladder and 67.4 km/s/Mpc from the cosmic microwave background has persisted despite a decade of searching for systematic errors.

Science, Astronomy & Space Sciences, Cosmology