The Big Bang.
The evidence of cosmic microwave background radiation supports the Big Bang theory.
The discovery of the cosmic microwave background radiation in 1965 by Penzias and Wilson provided strong evidence in support of the Big Bang theory, contradicting the predictions of the steady state theory. The steady state theory proposed a continuous creation of matter to maintain a constant density of the universe, but the presence of the cosmic microwave background radiation was better explained by the rapid expansion and cooling of the universe after the Big Bang.
cosmic microwave background radiation
The cosmic background radiation is believed to be the remains of the radiation emitted by the Universe when it started to get transparent - when it had cooled down to a temperature of about 3000 kelvin.
It as predicted from theory and discovered by accident by two telephone engineers that, when they saw it, thought it was some sort of interference noise in their instrument, (possibly caused by pigeons). When they were unable to eliminate the noise, they spoke about it to an academic friend who realised that what they were detecting may be the predicted microwave background radiation.
The 1964 discovery of cosmic microwave background radiation supported the Big Bang theory of the universe. This radiation is considered a remnant of the early stages of the universe when it was hot and dense, aligning with the predictions of the Big Bang model.
Cosmic background radiation provides important insights into the early universe, including its composition, density, and temperature. The presence of this radiation supports the theory of the Big Bang and helps explain the large-scale structure of the universe and the formation of galaxies. By studying cosmic background radiation, scientists can better understand the history and evolution of the universe.
In Cosmic Physics for $1000, Alex, "What is the Steady State Universe?"
The 'big bang' theory.
Scientists predicted that the Big Bang should have left behind a faint glow of radiation spread throughout the universe, known as the cosmic microwave background radiation. This radiation was discovered in 1965 and is considered one of the strongest pieces of evidence in support of the Big Bang theory.
The Doppler effect and background cosmic radiation are the big ones.
The Cosmic Microwave Background, discovered (almost by accident) in 1964, perfectly matches what the Big Bang Theory predicted. No other hypothesis can begin to explain it, beyond saying "Well, it's just there and I have no explanation why."