Why was the universe opaque for the first 380,000 years?*1 pointUnbonded electrons absorbed much of the electromagnetic radiation that was present.There was too much dust made from the earliest atoms blocking the light.No light was being emitted as there was low amounts of electromagnetic radiation.There was high levels of electromagnetic radiation, but only microwaves and radio waves which do not include visible light.
Question
Why was the universe opaque for the first 380,000 years?*1 pointUnbonded electrons absorbed much of the electromagnetic radiation that was present.There was too much dust made from the earliest atoms blocking the light.No light was being emitted as there was low amounts of electromagnetic radiation.There was high levels of electromagnetic radiation, but only microwaves and radio waves which do not include visible light.
Solution
The universe was opaque for the first 380,000 years because unbonded electrons absorbed much of the electromagnetic radiation that was present. During this period, known as the "recombination era," the universe was filled with a hot, dense plasma of electrons and protons. Photons (light particles) constantly interacted with these free electrons, being scattered and absorbed, which prevented light from traveling freely. It wasn't until the electrons combined with protons to form neutral hydrogen atoms that the universe became transparent, allowing light to travel across space and leading to the release of the cosmic microwave background radiation.
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