It would appear that James Webb Space Telescope observations of 10 nearby galaxies suggests the Hubble tension — which is a puzzling discrepancy in measurements regarding the rate of the expansion of the universe — may not be real after all.
The James Webb Space Telescope‘s observations put the average value of the Hubble constant (H0), key in determining the rate at which the universe is expanding, at 69.96 kilometers per second per megaparsec. This is indeed consistent with predictions stemming from the standard model of cosmology, which should sound like an end to the issue — but the findings also highlight a critical disagreement.
In 2013, the European Space Agency‘s Planck mission measured the Hubble constant to be 67.4 kilometers per second per megaparsecs. In other words, this means that every megaparsec (a million parsecs, or 3.26 million light-years) is expanding by 67.4 kilometers (41.9 miles) every second. The Planck science team was able to deduce this value of the Hubble constant by measuring the fundamental properties of the universe captured in the light of the cosmic microwave background (CMB) and then applying our standard model of cosmology to predict the expansion rate. Assuming the standard model is correct, this method should be accurate to within 1%.
Furthermore, measurements by a team led by Adam Riess of Johns Hopkins University, who have been…
Source www.space.com
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