
Webb telescope helps refine Hubble constant
created: May 28, 2025, 9:49 a.m. | updated: June 1, 2025, 5:53 a.m.
But thanks to the new James Webb Space Telescope, scientists from the University of Chicago have been able to take new and better data—suggesting there may be no conflict after all.
Freedman's latest calculation, which incorporates data from both the Hubble Telescope and the James Webb Space Telescope, finds a value of 70.4 kilometers per second per megaparsec, plus or minus 3%.
Webb has four times the resolution of the Hubble Telescope, which allows it to identify individual stars previously detected in blurry groups.
"We're really seeing how fantastic the James Webb Space Telescope is for accurately measuring distances to galaxies," said co-author Taylor Hoyt of the Lawrence Berkeley Laboratory.
More information: Wendy L. Freedman et al, Status Report on the Chicago-Carnegie Hubble Program (CCHP): Measurement of the Hubble Constant Using the Hubble and James Webb Space Telescopes, The Astrophysical Journal (2025).
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