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The James Webb Space Telescope has discovered two of the oldest galaxies ever seen in the universe, and they are much brighter than expected, meaning astronomers are rethinking their beliefs about how the first stars formed.
The two galaxies are believed to be billions of years old, just 100 million years after the Big Bang. Webb can look at some of the oldest galaxies, because he works in the infrared range, which means he can see redshift galaxies, Digitartlends reported.
The redshift occurs when the light from a distant galaxy shifts to the red end of the spectrum due to the expansion of the universe. Webb can see it.
Previous research has estimated that some of the galaxies Webb detected could have a redshift of up to 14, but the latest results are more accurate thanks to better instrument calibrations and indicate redshifts for the two galaxies of 10.5 and 12.5, respectively.
Webb also takes advantage of a phenomenon called gravitational lensing, in which a massive object such as a galaxy or cluster of galaxies has so much mass that it warps through space and acts like a magnifying glass, allowing researchers to see more distant galaxies behind it.
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