To astronomers, the background radiation discovered in 1965, known as the Cosmic Microwave Background Radiation (CMB), serves as compelling evidence for the Big Bang theory. This radiation is remarkably uniform and has a temperature of approximately 2.7 Kelvin (-270.45 degrees Celsius or -454.81 degrees Fahrenheit). By observing the CMB today, scientists can gain insights into the early universe, specifically how it looked roughly 380,000 years after the Big Bang when protons and electrons combined to form neutral hydrogen atoms, allowing photons to travel freely through space for the first time. The CMB provides a snapshot of the universe at that epoch and supports theories about its expansion and evolution over time.
To astronomers accidentally discovered background radiation which is evidence of universe expansion that supports the Big bang theory this is particularly stronger evidence because it's temperature is blank by observing this today you can see what the universe look like
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