Huge Problem With Our Universe Has Simple Answer, Physicists Say

For a decade, two ways of measuring how fast the universe expands have given different answers, a problem known as the “Hubble tension”. Now a group of physicists says the problem isn’t the supernovae but how we read the cosmic microwave background. The culprit, they say, is something we’ve ignored: magnetic fields from the birth of the universe. Crisis averted? Let’s take a look.
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