April 17, 2024


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The study concluded that the conflicting values ​​of the Hubble constant are not due to measurement error

Jennifer Ouellette reports via Ars Technica: Astronomers have made new measurements of the planet Hubble is fixedIt is a measure of how quickly the universe is expanding, by combining data from the Hubble Space Telescope and the James Webb Space Telescope. Their results It confirmed the accuracy of Hubble's previous measurement of the value of the constantaccording to their recent paper Published in The Astrophysical Journal Letterswith the consequent long-standing discrepancy in values ​​obtained by various observational methods known as the “Hubble tensor”.

There was a time when scientists thought the universe was static, but that changed with Albert Einstein's general theory of relativity. Alexander Friedmann published a set of equations showing that the universe might indeed be expanding in 1922, and Georges Lemaitre later made an independent derivation to reach the same conclusion. Edwin Hubble confirmed this expansion with observational data in 1929. Before that, Einstein had been trying to modify general relativity by adding a cosmological constant in order to obtain a fixed universe from his theory; After the discovery of Hubble, Legend saysHe referred to this effort as his biggest blunder. The article notes how scientists have used different methods to calculate the Hubble constant, including observing nearby celestial bodies, analyzing gravitational waves from cosmic events, and examining the cosmic microwave background (CMB). However, these methods yield different values, highlighting the challenge of accurately defining the constant. Recent efforts have included making additional observations of Cepheid variable stars and correlating them with Hubble data. The results also confirmed the accuracy of Hubble's data.

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“We have now covered the full scope of what Hubble observed, and we can rule out measurement error as a cause of Hubble jitter with very high confidence.” He said Co-author and team leader Adam Ries, a physicist at Johns Hopkins University. “Combining Webb and Hubble gives us the best of both worlds. We find that Hubble's measurements remain reliable as we climb further along the cosmic distance ladder. With measurement errors eliminated, what remains is the real and exciting possibility that we have misunderstood the universe.”