Cosmic background radiation, also known as cosmic microwave background (CMB) radiation, is the afterglow of the Big Bang that occurred approximately 13.8 billion years ago. It is pervasive throughout the universe, filling all of space and is a critical piece of evidence for the Big Bang theory of cosmology. Here are some key points about cosmic microwave background radiation: 1. **Nature of CMB**: CMB radiation is a type of electromagnetic radiation that is uniform in all directions.
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