The amplitude of the Cosmic Microwave Background (CMB) radiation has been accurately predicted and measured. The CMB is a faint, uniform radiation that permeates the entire observable universe and is considered one of the strongest pieces of evidence for the Big Bang theory.
The prediction of the CMB's amplitude was one of the significant successes of the Big Bang model. Theoretical calculations based on the physics of the early universe, particularly the theory of cosmic inflation, predicted the specific characteristics of the CMB, including its temperature and spatial variations.
Observations from the Cosmic Background Explorer (COBE) satellite in the early 1990s confirmed the predicted amplitude of the CMB with remarkable precision. Subsequent missions, such as the Wilkinson Microwave Anisotropy Probe (WMAP) and the Planck satellite, have further refined our understanding of the CMB and its properties, including its spectral shape, temperature fluctuations, and polarization.
The agreement between the predicted and observed amplitude of the CMB is a testament to the accuracy of the Big Bang model and provides strong evidence for the early universe's conditions and evolution. It has played a crucial role in our understanding of cosmology and the formation of large-scale structures in the universe.