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Image of NGC 5468, a galaxy located about 130 million light-years from Earth, combines data from the Hubble and James Webb space telescopes. Credit: NASA/ESA/CSA/STScI/A. Riess
yielded an estimate of about 244,000 km/h per Mpc . The simplest explanation for the discrepancy was that‘s measurements were inaccurate, perhaps because of uncertainties in the Cosmic Distance Ladder. Since it was launched in December 2021, the JWST has made its own measurements of Cepheid variables with its advanced infrared optics.. This includes Riess, the Bloomberg Distinguished and Thomas J. Barber Professor of Physics and Astronomy at John Hopkins University.
In particular, these findings have eliminated any lingering doubts that measurement inaccuracies might grow with distance. These inaccuracies would result from “stellar crowding,” where light from the Cepheids blended with that of adjacent stars. For many astronomers, the prospect of looking deeper into the Universe meant that these errors would become visible.
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