Science, Space and Technology News 2024
The “Hubble Tension,” a discrepancy in the universe’s expansion rate, is scrutinized through the combined efforts of the Hubble and James Webb Space Telescopes, revealing potential inaccuracies in cosmic measurements and hinting at new physical phenomena. Credit: SciTechDaily.comwas to use its observing power to give an exact value for the expansion rate of the universe. Prior to Hubble’s 1990 launch, observations from ground-based telescopes yielded huge uncertainties.
The bottom line is that the so-called “Hubble Tension” between what happens in the nearby universe compared to the early universe’s expansion remains a fascinating puzzle for cosmologists. There may be something woven into the fabric of space that we don’t yet understand. At the center of these side-by-side images is a special class of star used as a milepost marker for measuring the universe’s rate of expansion – a Cepheid variable star. The two images are very pixelated because they are a very zoomed-in view of a distant galaxy. Each of the pixels represents one or more stars. The image from the James Webb Space Telescope is significantly sharper at near-infrared wavelengths than Hubble .
The team’s first few Webb observations in 2023 were successful in showing Hubble was on the right track in firmly establishing the fidelity of the first rungs of the so-called cosmic distance ladder. But some astronomers suggested that, moving outward along the “second rung,” the cosmic distance ladder might get shaky if the Cepheid measurements become less accurate with distance. Such inaccuracies could occur because the light of a Cepheid could blend with that of an adjacent star – an effect that could become more pronounced with distance as stars crowd together and become harder to distinguish from one another.
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