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The Conversation

Levon Pogosian, Professor of Physics, Simon Fraser University

The Hubble tension: How magnetic fields could help solve one of the universe’s biggest mysteries

Edwin Hubble Universe United States NASA Hydrogen

An image taken by the Hubble Space Telescope in July 2025 of Abell 209, a massive spacetime-warping cluster of galaxies located 2.8 billion light-years away in the constellation Cetus. (NASA)

It’s well established that the universe is expanding, but there’s serious disagreement among scientists over how fast it’s happening.

Two of our best ways of measuring the cosmic expansion rate, the Hubble constant, give answers that are stubbornly at odds. This presents a major problem in modern cosmology known as the Hubble tension.

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