Yes, the discovery of cosmic microwave background radiation (CMB) is indeed a significant piece of evidence supporting the Big Bang theory and the expansion of the universe.
In 1965, Arno Penzias and Robert Wilson, two American radio astronomers, detected a faint, uniform microwave radiation coming from all directions in the sky. They initially thought this radiation could be due to interference or other environmental noise. However, it turned out to be the remnant heat from the Big Bang, which occurred approximately 13.8 billion years ago.
The CMB is essentially the afterglow of the Big Bang, cool enough to have stretched into microwave wavelengths due to the expansion of the universe. Its uniformity and slight fluctuations in temperature provide critical evidence for the Big Bang model. The small variations in the CMB are also crucial for understanding the large-scale structure of the universe and the formation of galaxies.
Overall, the discovery of the CMB was a landmark finding in cosmology and has profoundly shaped our understanding of the universe's origins and its expansion over time.
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