Space
How Giant Galaxies Formed Just 1.4 Billion Years After the Big Bang
New observations are forcing astronomers to rethink models of galaxy formation after discovering massive galaxies that existed when the universe was only 1.4 billion years old. These ancient giants shouldn't exist according to standard cosmological models, prompting a reassessment of how quickly structure can emerge in the early universe.
Key Takeaways
- JWST has found galaxies with tens of billions of solar masses existing just 1.4 billion years after the Big Bang
- Standard models predict such massive galaxies should take many billions of years to form
- Proposed explanations include higher star formation efficiency and early supermassive black holes
- The findings could indicate gaps in our understanding of dark matter or cosmic expansion
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