The James Webb Space Telescope peered into one of the universe's oldest galaxy clusters, and scientists can...
Astronomers using the James Webb Space Telescope have identified a massive, highly evolved galaxy cluster named XLSSC 122 dating back 10.4 billion years. This discovery challenges existing models of cosmic evolution, as such complex structures were not previously thought to exist so early in the universe's history.
Why it matters
The existence of such a mature cluster at 'cosmic noon' forces scientists to rethink the timeline and mechanisms of galaxy formation and dark matter distribution.
View comments Robert Lea Mon, June 29, 2026 at 12:00 PM UTC 4 min read View comments Add Yahoo as a preferred source to see more of our stories on Google. Key takeaways Powered by Yahoo Scout. Yahoo is using AI to generate key points from this article. This means the info may not always match what’s in the article. Reporting mistakes helps us improve the experience. Astronomers using the James Webb Space Telescope have discovered a massive and highly evolved galaxy cluster at "cosmic noon," challenging previous theories of cosmic evolution. The galaxy cluster XLSSC 122, observed around 10.4 billion years ago, is acting as a gravitational lens, amplifying light from even more distant galaxies and providing valuable insights into dark matter distribution. Gravitational lensing, a phenomenon predicted by Albert Einstein's theory of general relativity, allows astronomers to study ancient galaxies and test cosmological models by measuring the invisible dark matter in galaxy clusters like XLSSC 122. See more When you buy through links on our articles, Future and its syndication partners may earn a commission.
The article reports on scientific findings without political or social agenda.
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