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The Webb Telescope further deepens the Hubble tension controversy in cosmology
A long-awaited study of the cosmic expansion rate suggests that when it comes to the Hubble tension, cosmologists are still missing something.
One of these teams, led by Adam Riess of Johns Hopkins University, has consistently measured H 0 to be about 8% higher than the theoretical prediction for how fast space should be expanding, based on the cosmos’s known ingredients and governing equations. Saul Perlmutter, a Nobel Prize-winning cosmologist at the University of California, Berkeley, who was shown the team’s preprint prior to its release, told Quanta that the results suggest “we may have a Hubble tension just within the [star-based] measurements. When the house-size Webb telescope launched in December 2021, Riess and his colleagues turned to its powerful infrared camera to pierce the dust in the crowded regions where Cepheids live.
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