Relic radiation – Coming with the same intensity from all sides of the sky, electromagnetic radiation has a spectrum corresponding to thermal radiation at a temperature of 2.73 K. It is also called microwave background radiation or microwave electric radiation. It is believed that about 13 billion years of relic radiation were created. years ago, when the universe as a whole was much denser and hotter than it is now. During the further expansion of the universe, the radiation temperature decreased by about 1000 times.
Relic radiation
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