The cosmic microwave background reveals the early universe from "summary" of La vita del cosmo by Lee Smolin
The cosmic microwave background is a faint glow of radiation that fills the universe, coming from all directions. This radiation provides us with crucial information about the early universe, as it dates back to just a few hundred thousand years after the Big Bang. The cosmic microwave background was first discovered in 1965 by Arno Penzias and Robert Wilson, who were working with a radio telescope. They found that no matter where they pointed their telescope, they detected a uniform background radiation. This radiation was not associated with any known source and was the same in all directions. The cosmic microwave background radiation is crucial because it reveals the conditio...
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