Researchers from NASA, ESA, CSA, and the Space Telescope Science Institute (STScI) have utilized a special class of star known as the Cepheid variable star to measure the rate of expansion of the universe. These stars have played a crucial role in helping scientists understand the vastness and evolution of the cosmos.
In a groundbreaking study, scientists have compared side-by-side images of a distant galaxy captured by the James Webb Space Telescope and the Hubble Space Telescope. The image from the Webb telescope, taken at near-infrared wavelengths, is significantly sharper than the image from the Hubble telescope. Each pixel in these images represents one or more stars, allowing for a more detailed analysis of the galaxy.
The clearer vision provided by the Webb telescope has enabled researchers to reduce clutter in the images, making the Cepheid variable stars stand out more prominently. This has allowed for more accurate measurements of the stars’ properties and distances.
Furthermore, the Webb telescope has been instrumental in confirming the accuracy of previous Hubble observations regarding the universe’s expansion rate and age. This collaboration between different space agencies and institutions, including Adam G. Riess from Johns Hopkins University and STScI, has shed new light on our understanding of the vast universe we inhabit.
By using cutting-edge technology and collaboration among experts in the field, researchers are continuing to push the boundaries of our knowledge of the cosmos. The discoveries made through studies like this one will undoubtedly shape our understanding of the universe for years to come.
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