Keith Cooper is a freelance science journalist and editor in the United Kingdom, and has a degree in physics and astrophysics from the University of Manchester.
Jam packed issues filled with the latest cutting-edge research, technology and theories delivered in an entertaining and visually stunning way, aiming to educate and inspire readers of all agesNGC 3972, which is a galaxy 66 million light years away in Ursa Major, was one of the 10 galaxies used to measure the expansion of the universe in a new study.
The Cepheid variables, though, were not playing ball. From them, the CCHP team arrived at a value of 72.04 km/s/Mpc, which is not in agreement with the other measurements. Taken together, the four methods give a average value of 69.96 km/s/Mpc. "Based on these new JWST data and using three independent methods, we do not find strong evidence for a Hubble tension," said Freedman in aYet, the Cepheid variable measurements do seem to continue to provide tension. Cepheids form the bottom rung of the cosmic distance ladder, with type Ia supernovas as the next rung up because they can be seen out to greater distance than Cepheids.
Earlier this year, Riess led a team that used the JWST to double-check Hubble's observations of Cepheids and came to the conclusion that. However, in their research paper, Freedman and fellow researchers point out that the two methods least affected by crowding — the tip of the red giant branch and the carbon stars — give values in accordance with the standard model.
He's the author of"The Contact Paradox: Challenging Our Assumptions in the Search for Extraterrestrial Intelligence" and has written articles on astronomy, space, physics and astrobiology for a multitude of magazines and websites.
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