Is Cosmic Microwave Background Radiation?
CMB is the universe's oldest and most distant light it's from shortly after the Big Bang, the beginning of the cosmos.
It's not visible light though. Visible light is just one sort of light Microwaves, X-rays, and radio waves are all types of light.
Initially, CMB was X-ray light. The microwaves have lost energy over time.
The universe was hot, dense, and full of electrons and protons at this time
When light hits one of these charged particles, the electric charge deflects it. This limited light's range
The universe grew and cooled throughout time. As the universe cooled, electrons and protons bonded to form hydrogen atoms
These atoms are neutral, thus they don't effect light like electrons and protons do. Light may pass through them and fill the universe.
The universe cooled evenly, thus this process happened everywhere at once.
Light may go far and rapidly from everywhere at once. Today, this light reaches Earth as the CMB.
CMB light was constantly in the cosmos but couldn't travel far until atoms developed. 380,000 years after the Big Bang, it was released
Since the universe is about 14 billion years old, this happened when it was extremely young.
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