The James Webb Space Telescope has highlighted the “Hubble tension,” where the universe’s expansion rate appears inconsistent. Measurements from the early universe align with current models, but those closer to Earth do not. A study using light from a distant supernova supports this discrepancy, suggesting the issue persists. Two methods to calculate the Hubble constant yield conflicting results: cosmic microwave background data suggests 67 km/s/Mpc, while Cepheid variables indicate 73.2 km/s/Mpc. This inconsistency challenges the standard cosmological model, particularly the role of dark energy.

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