New synthesis of astronomical measurements shows Hubble tension is real
noirlab.edu
April 11, 2026
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Summary
An international collaboration of astronomers has achieved one of the most precise measurements of the local Universe's expansion rate. This measurement reveals a persistent mismatch that may indicate the need for new physics beyond current cosmological models.
Key Takeaways
- The H0 Distance Network Collaboration reported a Hubble constant value of 73.50 ± 0.81 kilometers per second per megaparsec, achieving a precision of just over 1%.
- There is a persistent discrepancy, known as the Hubble tension, between the local Universe's measured expansion rate and predictions from the cosmic microwave background, with local measurements indicating a higher rate of around 73 km/s/Mpc compared to 67-68 km/s/Mpc from early Universe predictions.
- The study utilized a "distance network" approach, integrating multiple independent techniques for measuring distances, which reinforces the reliability of the locally measured expansion rate despite the ongoing tension.
- The research involved contributions from telescopes at NSF Cerro Tololo Inter-American Observatory and NSF Kitt Peak National Observatory, highlighting a collaborative effort across ground and space-based observatories.
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