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ACT Confirms Hubble Tension, Concludes Two-Decade Mission

2/28/2026

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Summary

Story summary

The Atacama Cosmology Telescope (ACT) released its final data, confirming the Hubble tension and ruling out many extended cosmological models.
Three papers from ACT refine measurements of the Hubble constant and align with the European Space Agency's Planck satellite polarization results.
The ACT mission, spanning nearly two decades, has concluded.
The data will continue to support future scientific exploration.

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Story summary

The Atacama Cosmology Telescope (ACT) released its final data, confirming the Hubble tension and ruling out many extended cosmological models.
Three papers from ACT refine measurements of the Hubble constant and align with the European Space Agency's Planck satellite polarization results.
The ACT mission, spanning nearly two decades, has concluded.
The data will continue to support future scientific exploration.