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About a year ago: Breakthrough data from James Webb confirms there's a major gap in our understanding of the cosmos — and reveals unknown physics exists. A major mystery at the heart of cosmology just deepened. In a joint effort, NASA’s James Webb and Hubble space telescopes have confirmed a puzzling discrepancy in the universe’s rate of expansion—known as the Hubble Tension. While one method, based on the cosmic microwave background from the early universe, predicts a slower expansion, another method—based on direct observations of stars and galaxies today—reveals a much faster rate. Crucially, the new observations of over 1,000 Cepheid stars across galaxies up to 130 million light-years away confirm that the discrepancy isn’t due to flawed measurements, but a real inconsistency in our models of the universe. This cosmic conundrum challenges a foundational aspect of physics: that the rules governing the cosmos should remain constant over time. If the Hubble Tension can’t be explained by observational error, it could signal the need for entirely new physics—such as changes in dark energy, new forms of matter, or even modifications to Einstein’s theory of gravity. For now, scientists are grappling with a profound implication: the universe may not be playing by the rules we thought we understood. Source: Riess, A.G. et al. (2024). “A Precision Hubble Constant Measurement from the Hubble Space Telescope and the James Webb Space Telescope.” Astrophysical Journal Letters.Breakthrough data from James Webb suggests a serious gap in our understanding of the cosmos