Expansion leads to increased tension

JWST observations seem to confirm cosmology's biggest conundrum

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Cosmologists like an argument, and one of the biggest surprises of the last decade has been the slow с emergence of a disagreement between various methods of measuring the Hubble Constant, the speed of the Universe's expansion. Two camps exist. There are those who study the cosmic microwave background, light emitted just 400,000 years after the Big Bang, and extrapolate forward to work out the Constant. They get consistently higher values than their rivals, who measure expansion directly by observing the present-day Universe. As each set of measurements has grown more accurate, this difference - euphemistically known as the 'Hubble tension' - has only increased.