Why did the first galaxies form so quickly after the Big Bang?
Quick Answer
Tiny density fluctuations in the young Universe grew under gravity, and dark matter helped pull gas into the first structures. Once gas cooled, the first stars and galaxies could form surprisingly early.
The Full Story
The early Universe was not perfectly smooth; it contained small density variations seen today in the cosmic microwave background. Over time, gravity amplified those fluctuations, especially in regions dominated by dark matter. Gas collected in these gravitational wells, cooled, and formed the first stars and protogalaxies. Observations from JWST have revealed very early galaxies that show how rapidly structure emerged after the Big Bang.
Key Facts
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