James Webb Telescope confirms the expansion rate of the universe

Astronomers have used a variety of techniques to evaluate this situation. Expansion rate of the universe, very important to understand your age and future trajectory. Initially, the margin of error was wide enough to allow several central predictions to coexist comfortably.

But even as telescopic technology improves, there are still inconsistencies in the celestial objects studied. This dilemma is now known as the “Hubble Tension,” named after the Hubble Constant, a numerical value that summarizes the relationship between the distance and speed of distant celestial objects.

JWST was expected to be It could help measure the distance between distant galaxies and solve a cosmic problem. Instead it corrected conflicting information from other telescopes.

“Think of it like squinting your eyes to read a distant road sign and trying to decipher its words and meanings. “Even with the best telescopes, we still have similar problems across the galaxy.” Professor Adam Riess from Johns Hopkins University, who won the Nobel Prize in Physics in 2011 for proving that the universe is expanding faster, said:

“We study the cosmic velocity indicator, also known as the Hubble Constant, imprinted on stars in distant galaxies. The light from particular stars reveals their distance from us and the time it takes for the light to reach Earth. The redshift of galaxies reveals how much the universe expanded during this period.“This ultimately reveals the speed of cosmic expansion.”

Riess is known for using Type Ia supernovae for such measurements because they have a very consistent intrinsic brightness. Another option is to use Cepheid variables, which are abundant and directly related to luminosity and rate of expansion and contraction. These first stars revealed a universe much larger than the Milky Way.

Although Cepheid variables do not have the required brightness to be observed in galaxies hundreds of millions of light-years away, they can be used as precise calibration tools for supernova measurementsif they are isolated from neighboring stars.

JWST is particularly expert in this regard, and Riess and his team using it More than 320 Cepheid variables have been measuredSome are in relatively nearby galaxies NGC 4258 and NGC 5584.

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