JWST's Expansion Rate Measurement Leaves Astronomers Perplexed
The James Webb Space Telescope (JWST) has measured the expansion rate of the Universe, confirming the Hubble Space Telescope's data and leaving astronomers puzzled by the Hubble tension. The Hubble tension refers to the discrepancy between different measurement methods for determining the expansion rate. JWST's observations of Cepheid variables, a crucial tool for measuring distances, have reduced the noise found in Hubble's data. However, the Hubble tension remains unresolved, and the cause, possibly dark energy, continues to elude scientists. The results have been published in The Astrophysical Journal.