The JamesWebb Space Telescope has discovered two of the earliest galaxies ever seen in the universe, and they are much brighter than expected.
The James Webb Space Telescope has discovered two of the earliest galaxies ever seen in the universe, and they are much brighter than expected, meaning astronomers are rethinking their beliefs about how the earliest stars formed.
The two galaxies are thought to be billions of years old, from just 100 million years after the Big Bang. Webb is able to look back at some of the earliest galaxies, because it operates in the infrared range, meaning it can see galaxies that are redshifted. Webb also takes advantage of a phenomenon called gravitational lensing, in which a massive object like a galaxy or galaxy cluster has so much mass that it warps space and acts like a magnifying glass, allowing researchers to see even more distant galaxies behind it.
“We’ve nailed something that is incredibly fascinating. These galaxies would have had to have started coming together maybe just 100 million years after the Big Bang. Nobody expected that the dark ages would have ended so early,” said another of the researchers, Garth Illingworth. “The primal Universe would have been just one hundredth of its current age. It’s a sliver of time in the 13.8-billion-year-old evolving cosmos.
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