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Searching for: How the NIR technique of JWST did calculate present age of the Universe as 27 billion years instead of 15 billion years?
Searching for: How the NIR technique of JWST did calculate present age of the Universe as 27 billion years instead of 15 billion years?
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The James Webb Space Telescope (JWST) detected four ancient galaxies in the early months of its operations that are the oldest scientists have ever seen and nearly as old as the universe itself. The galaxies were among hundreds of promising stellar conglomerations found in images from the Near Infrared Camera (NIRCam) aboard the James Webb Space Telescope (Webb or JWST). But scientists were only able to confirm that these ancient objects really were as old as they appeared after they looked at them in detail with the Near Infrared Spectrograph, which revealed their chemical composition and determined how fast these galaxies are moving away from Webb. The astronomers now know that light from the four galaxies took more than 13.4 billion years to reach Webb. More precisely, the telescope sees the galaxies as they looked only 350 million years after the Big Bang, when the universe was only 2% of its current age, although the galaxies must have started to form even earlier 1.
The age of the universe is estimated to be around 13.797 billion years using the Lambda-CDM concordance model 2. However, a new study claims that deep space observations of JWST have revealed that the structure and masses of very early Universe galaxies at high redshifts (z∼15 ∼15), existing at an epoch when the Universe was only 500 million years old, are consistent with an older Universe age of 26.7 billion years 3.
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