Light's Early Universe Journey
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Did light exist at the beginning of the universe?

86% Informative
At first , the early universe's light was "trapped," and it took several hundred thousand years for it to escape.
As the universe expanded, the density of its energy decreased, and it cooled.
By about three minutes after the Big Bang , protons and neutrons could fuse together to create the nuclei of atoms such as helium.
After the Big Bang , the universe experienced a period known as the cosmic dark ages.
Eventually, after millions of years , the gravitational pull of clouds of gas led these clumps of matter to collapse in on themselves.
This created the first generation of stars, and the universe had galaxies full of stars by about 1 billion years .
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