We can't see any light beyond 300 thousand years after the universe was created. When the universe was was in its most hot, dense, primordial state, it was we call a plasma. The sun is eight minutes away from earth and takes photons to travel that distance - but if you look at the sun, you can't see inside where these particles are occurring. It's proof that sunlight doesn't exist outside of our solar system as many people believe.

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