Earliest known Galaxy 13.2 bya
As time went on, the dense parts grew denser and the Universe began to acquire its current structure. The oldest galaxy discovered so far was formed 480 million years after the creation. This marked the end of the Cosmic Dark Age.
The following image is a reconstruction of what the dark matter might have looked like at that time.
Simulation of Universe 480 my after creation. Click for image credit.
The dense parts, where the first stars were forming, show up as scattered dots bigger than the rest.
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