James Webb has managed to confirm the ‘error’ discovered by Hubble years ago, which claimed that the universe expands at different speeds in each direction and at a much faster rate. The James Webb and Hubble telescopes not only seek to unveil the greatest mysteries of space but also to raise new questions for a better understanding of the cosmos.
There is something wrong with the Universe’s measurement models that challenges established cosmological theories and suggests that the current understanding of the fundamental structure of galaxies may be incomplete.
An error has been found in the measurements of the Universe, but what is it?
In 2019, the Hubble Space Telescope confirmed through its collected measurements the issue that would be called the Hubble tension, which claims that the universe is expanding faster than expected.
According to NASA, despite Hubble measuring the rate of expansion of the universe for 30 years, its successor, the James Webb Telescope, has managed to confirm its data in a much more precise way, although “these combined data still present a cosmic puzzle.”
Although this error may be good news, in reality, according to the study published on February 6 in the Astrophysical Journal Letters, it deduces that there may be something wrong with our understanding of the universe.
To reach this conclusion, Riess and the rest of the researchers relied on their previous measurements, analyzing 1,000 more Cepheid stars in five distant galaxies more than 100 million light-years from Earth.
By comparing their data with that of the Hubble Telescope, astronomers were able to confirm their previous measurements of the Hubble constant. This is what astronomer Riess confirmed: “The combination of Webb and Hubble gives us the best of both worlds. We found that Hubble’s measurements remain reliable as we climb farther up the cosmic distance ladder.”
What is the Hubble tension?
The “Hubble tension” highlights a fundamental uncertainty: Although it is a fact that the cosmos is expanding in all directions, scientists still struggle to determine the exact speed of this expansion. The fact that we still cannot calculate it accurately suggests that there may be a variable still unknown in our understanding. It is a reminder that we are still in the early stages of fully understanding the universe.
Although it may seem unchanging to us, everything in the universe is actually moving away from us at a speed calculated as the “Hubble Constant.” This speed, which is consistent with measurements from the Webb and Hubble telescopes, would be about 73 kilometers per second per megaparsec.