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Why do you suppose that the Hubble constant was such a controversial and hotly contested number...

Why do you suppose that the Hubble constant was such a controversial and hotly contested number for so many decades?

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One of the most fundamental and controversial measurements in cosmology, Hubble's constant (H0), informs scientists about how rapidly the Universe is expanding. The debate about the value of H0 has heated up recently as increasingly precise measurements from different techniques are converging on different values for H0. This discrepancy either means that the H0measurements have systematic errors larger than astrophysicists can explain, or it reveals something profound about the physics underlying our universe

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