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"The cosmic microwave background radiation is a faint, nearly uniform glow of microwave radiation that fills the universe, providing insights into the early universe's structure and evolution through temperature and polarization anisotropies resulting from complex physical processes involving the expansion of the universe, gravitational effects, and radiation propagation.

SpaceBlaze:

"The cosmic microwave background radiation is like a faint glow of microwave light that's everywhere in the universe, and it tells us about how the universe looked a long time ago and how it has changed over time."