Why Scientists Are Scratching Their Heads Over the Universe’s Expansion

Summary

The Hubble Tension is a discrepancy in the measurements of the universe's expansion rate, obtained using two different methods. One method, using the Hubble Space Telescope, measures the expansion rate of nearby stars and galaxies, suggesting a faster expansion rate of 73 kilometers per second per megaparsec. The other method, based on the Planck satellite's observations of the early universe, points to a slower rate of 67 kilometers per second per megaparsec. The James Webb Space Telescope has provided new data seemingly aligning with the Hubble findings, deepening the mystery of the discrepancy. Scientists are investigating various explanations, from new physics to measurement errors, in a quest to unravel this puzzle and gain a deeper understanding of the universe's expansion.

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