Story perspectives

New Findings Deepen Hubble Tension, Hint at New Physics

12/6/2025

Summary

Story summary

Astronomers in Maunakea, Hawai‘i, report precise measurements of the universe's expansion rate, deepening the Hubble tension.
The tension stems from early-universe values near 67 km/s/Mpc and local values near 73 km/s/Mpc, a discrepancy that implies potential new physics.
The Atacama Cosmology Telescope's final data corroborates the tension and rules out many extended models of the universe's evolution.
Experts emphasize independent verification and continued investigation to resolve this significant cosmological mystery.

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Story summary

Astronomers in Maunakea, Hawai‘i, report precise measurements of the universe's expansion rate, deepening the Hubble tension.
The tension stems from early-universe values near 67 km/s/Mpc and local values near 73 km/s/Mpc, a discrepancy that implies potential new physics.
The Atacama Cosmology Telescope's final data corroborates the tension and rules out many extended models of the universe's evolution.
Experts emphasize independent verification and continued investigation to resolve this significant cosmological mystery.