Credit: Lawrence Berkeley National Lab
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The Hubble tension
One experimental anomaly that has bedeviled physicists and cosmologists for years is the discrepancy in values of the Hubble constant based on different experimental approaches. This discrepancy is now known as the Hubble tension.
The Hubble constant $H_0$ is a measure of the rate of expansion of the universe, and is directly connected to estimates of the age $A$ of the universe via the relation $A = 1 / H_0$. Units must be converted here, since the age of the universe is
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